{"id":"https://data.mapsnap.org/runs/v1.3/iiif/loc/sanborn07494_007.main.iiif.json","type":"AnnotationPage","@context":["http://www.w3.org/ns/anno.jsonld"],"label":"Allentown, Pennsylvania | 1957 | mapsnap generated fit (2026-09-21)","creator":{"type":"Software","name":"mapsnap","homepage":"https://mapsnap.org"},"rights":"https://opendatacommons.org/licenses/odbl/1-0/","metadata":[{"label":"generated","value":"2026-09-21"},{"label":"run","value":"corpus-v1"},{"label":"pages","value":"102"},{"label":"placed","value":"91"},{"label":"unplaced","value":"11"},{"label":"fit sources","value":"georef 79, georef-snap 12"},{"label":"key map","value":"none"},{"label":"split sheets","value":"10 sheet(s) cut into 24 panels"},{"label":"unplaced pages","value":"p35__2 (tier 1, 40.60293,-75.47219 +/-116m); p36 (tier 1, 40.60275,-75.46948 +/-278m); p37__1 (tier 2, 40.60835,-75.45722 +/-264m); p37__2 (tier 1, 40.60594,-75.45625 +/-124m); p37__3 (tier 1, 40.60285,-75.46027 +/-100m); p38__3 (tier 1, 40.60777,-75.45935 +/-145m); p43__1 (tier 2, 40.61512,-75.45789 +/-258m); p43__2 (tier 1, 40.61483,-75.46365 +/-206m); p45 (tier 1, 40.61690,-75.46253 +/-262m); p75__2 (tier 1, 40.62148,-75.46111 +/-100m); p78__3 (tier 1, 40.60651,-75.48907 +/-220m)"}],"items":[{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0001/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p1","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0001/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0001/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"612.0,1791.2 659.0,200.5 3984.5,340.6 3956.7,2431.8 3758.2,2427.2 3683.5,4833.8 4352.0,5095.4 4352.0,5400.0 -0.0,5400.0 -0.0,2129.5 368.8,2068.7 612.0,1791.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0001/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2840.0,2404.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4722218,40.5989039]}},{"type":"Feature","properties":{"resourceCoords":[640.0,1512.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4743664,40.5989366]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0010/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p10","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0010/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0010/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4231.0,460.9 4267.2,4701.7 31.6,4740.9 -0.0,517.5 4231.0,460.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0010/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46861713534592,40.603059209421225]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46794741997535,40.601590277266276]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47033121303399,40.600954897764765]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47100092840456,40.602423829919715]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0011/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p11","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0011/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0011/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1694.0,2557.1 1693.9,2542.3 1680.4,408.7 3849.3,394.0 3850.7,2520.6 3394.1,2526.1 3392.5,3598.8 3855.1,3589.1 3874.2,4660.3 1708.2,4687.6 1694.0,2557.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0011/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2776.0,1456.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4682355,40.6039905]}},{"type":"Feature","properties":{"resourceCoords":[3848.0,1456.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4672913,40.604244]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0012/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p12","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0012/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0012/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2217.5,4673.7 485.9,4709.1 465.0,3632.4 -0.0,3642.8 -0.0,2564.7 459.0,2558.4 454.3,420.8 2199.2,405.0 2217.5,4673.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0012/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1448.0,3136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.465912,40.6033799]}},{"type":"Feature","properties":{"resourceCoords":[464.0,3136.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4667747,40.6031494]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0013/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p13","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0013/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0013/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3919.8,2725.4 3905.4,5400.0 -0.0,5400.0 -0.0,623.2 3446.9,605.8 3494.3,2748.2 3919.8,2725.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0013/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46609425734334,40.60583850725015]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46234103658249,40.606863676233665]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46067731970336,40.60330302126904]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46443054046422,40.602277852285525]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0014/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p14","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0014/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0014/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3443.0,4486.0 1071.9,4484.3 1090.4,2743.7 669.5,2765.4 637.3,635.4 3435.0,633.7 3443.0,4486.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0014/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3440.0,3572.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.459565,40.6049804]}},{"type":"Feature","properties":{"resourceCoords":[2044.0,636.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.461709,40.606588]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p15 [1]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3857.5,489.3 580.0,412.0 593.1,4635.6 1834.0,4228.1 3076.0,3616.1 3377.2,3325.4 3963.2,3043.1 3233.6,2723.2 3346.2,2481.8 3648.0,2483.1 4352.0,2757.8 4352.0,0.0 4114.1,0.0 3857.5,489.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[572.0,2516.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4598333,40.6055363]}},{"type":"Feature","properties":{"resourceCoords":[580.0,412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4604976,40.6069232]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p15 [2]","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"},{"label":"split_canvas_x","value":"2457.2"},{"label":"split_canvas_y","value":"3828.4"},{"label":"split_canvas_w","value":"1894.8"},{"label":"split_canvas_h","value":"1571.6"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3628.1,5400.0 4352.0,5400.0 4352.0,3845.6 3541.1,3835.0 3657.0,4083.6 2487.9,4282.5 2479.2,4598.2 3386.5,4577.2 3245.2,4708.6 3628.1,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0015__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4663.8,4140.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4556869,40.6062081]}},{"type":"Feature","properties":{"resourceCoords":[2777.0,4140.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.457177,40.606303]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0016/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p16","metadata":[{"label":"streets","value":"3"},{"label":"intersections","value":"2"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0016/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0016/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1684.8,1066.5 2009.5,-0.0 4352.0,-0.0 4352.0,5400.0 2915.3,5400.0 -0.0,4245.0 -0.0,335.3 132.0,376.0 130.3,593.3 1684.8,1066.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0016/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[132.0,376.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4591388,40.6041462]}},{"type":"Feature","properties":{"resourceCoords":[132.0,2760.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4609494,40.602946]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0017/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p17","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0017/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0017/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"433.1,4640.6 440.9,411.0 4066.5,392.9 4056.3,4632.2 433.1,4640.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0017/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1644.0,2524.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.487263,40.601125]}},{"type":"Feature","properties":{"resourceCoords":[1644.0,404.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.48793,40.602522]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0018/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p18","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"26"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0018/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0018/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"275.9,4675.8 265.4,435.8 3727.3,429.4 3737.2,2532.6 4030.4,2537.3 4033.2,4642.3 275.9,4675.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0018/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4032.0,3596.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4815759,40.6019097]}},{"type":"Feature","properties":{"resourceCoords":[276.0,4044.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.484702,40.600729]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0019/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p19","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0019/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0019/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"800.7,2565.8 509.4,2557.7 524.0,468.0 -0.0,462.8 0.0,-0.0 3202.1,4.9 3197.1,493.9 3861.3,500.5 3822.0,3639.1 4303.7,3640.4 4352.0,5400.0 3811.7,5400.0 3819.4,4673.2 779.1,4657.3 800.7,2565.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0019/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2812.0,3632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4798098,40.6023954]}},{"type":"Feature","properties":{"resourceCoords":[524.0,468.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4828235,40.6039279]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0002/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p2","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"14"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0002/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0002/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3326.6,5196.8 4352.0,5190.9 4352.0,5400.0 673.2,5316.1 663.9,5017.9 -0.0,4780.9 -0.0,2417.2 194.9,2415.7 157.2,292.6 3468.3,264.7 3491.5,2395.6 2832.3,2512.2 2843.1,3387.2 3326.6,5196.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0002/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3480.0,1340.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4687378,40.6006223]}},{"type":"Feature","properties":{"resourceCoords":[1288.0,2408.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4703219,40.599415]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0020/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p20","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0020/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0020/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,-0.0 667.8,0.0 3488.0,468.0 4352.0,4668.6 4352.0,5400.0 2441.0,5400.0 2437.8,5068.7 1199.6,4679.0 658.0,3634.7 -0.0,490.0 -0.0,-0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0020/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3488.0,4676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4761318,40.6026207]}},{"type":"Feature","properties":{"resourceCoords":[3488.0,468.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4774492,40.605409]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0021/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p21","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0021/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0021/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"653.9,430.9 3865.9,437.4 3881.7,2533.6 4352.0,2532.5 4352.0,5400.0 2792.7,5400.0 2792.0,4640.0 1730.6,4640.0 1727.7,5400.0 1497.2,5367.9 1500.2,4640.0 636.0,4640.0 653.9,430.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0021/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2792.0,4640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4742536,40.6031391]}},{"type":"Feature","properties":{"resourceCoords":[636.0,4640.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4761318,40.6026207]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0022/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p22","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"6"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0022/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0022/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,2555.9 442.8,462.9 3744.0,460.0 3727.9,4567.9 2629.3,4684.6 -0.0,3618.8 -0.0,2555.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0022/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1528.0,460.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.473704,40.606443]}},{"type":"Feature","properties":{"resourceCoords":[3744.0,460.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4717724,40.6069822]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0023/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p23","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"9"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0023/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0023/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3920.4,4692.2 746.0,4706.1 723.8,490.3 3928.0,484.0 3920.4,4692.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0023/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3928.0,2596.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4683038,40.6063426]}},{"type":"Feature","properties":{"resourceCoords":[3928.0,484.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4689653,40.6077484]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0024/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p24","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0024/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0024/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3553.6,4673.5 2446.5,4675.5 2441.1,5400.0 2219.9,5400.0 2224.0,4676.0 436.8,4674.4 466.3,448.7 3616.8,455.2 3553.6,4673.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0024/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2224.0,4676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.466096,40.6053738]}},{"type":"Feature","properties":{"resourceCoords":[2224.0,452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4674326,40.6081685]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0025/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p25","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0025/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0025/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"264.9,4591.0 337.5,568.8 4103.0,591.9 4049.0,4612.5 264.9,4591.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0025/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1868.0,4596.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4750028,40.6092094]}},{"type":"Feature","properties":{"resourceCoords":[4068.0,2628.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.473726,40.61104]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0026/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p26","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0026/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0026/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"372.3,4662.1 364.8,491.4 3633.7,475.6 3675.1,4629.7 372.3,4662.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0026/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1464.0,2548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4743555,40.607839]}},{"type":"Feature","properties":{"resourceCoords":[3664.0,2548.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4724326,40.608361]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0027/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p27","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0027/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0027/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5400.0 -0.0,1075.6 439.1,1080.9 449.5,410.5 2871.3,450.0 2861.0,1065.0 4080.0,1093.7 4020.1,4702.6 2799.9,4681.4 2789.4,5302.1 2512.8,5300.4 2512.1,5400.0 -0.0,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0027/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49606773438823,40.603733407688715]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49233159958143,40.60481854774853]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49057061215187,40.60127399188881]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49430674695867,40.600188851828996]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0028/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p28","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0028/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0028/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"840.9,4758.2 846.1,2648.7 2056.0,2644.0 2057.0,2136.2 2055.9,1139.8 844.6,1149.3 845.0,535.7 3269.5,524.6 3270.6,4752.1 840.9,4758.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0028/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2056.0,2644.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4906875,40.6033335]}},{"type":"Feature","properties":{"resourceCoords":[2056.0,4756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.490027,40.601939]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0029/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p29","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0029/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0029/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"380.1,4742.4 383.6,1990.6 1595.8,1999.1 1609.9,1177.0 384.0,1118.2 395.6,503.8 4021.6,505.4 4011.5,4729.2 380.1,4742.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0029/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2796.0,2624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4875475,40.6042014]}},{"type":"Feature","properties":{"resourceCoords":[4012.0,2624.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4864943,40.6044925]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0003/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p3","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0003/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0003/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"453.2,5377.5 -0.0,3568.9 -0.0,2651.8 661.0,2576.6 664.0,444.0 3907.6,430.1 3859.1,3992.4 4352.0,4503.7 4352.0,4925.0 3874.1,5400.0 453.2,5377.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0003/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[664.0,444.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4690724,40.6013296]}},{"type":"Feature","properties":{"resourceCoords":[2808.0,444.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4672173,40.6018377]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0030/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p30","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"9"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0030/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0030/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"854.9,4682.4 860.0,460.0 3291.0,478.6 3277.1,4690.3 854.9,4682.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0030/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2068.0,4700.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.484774,40.603386]}},{"type":"Feature","properties":{"resourceCoords":[860.0,460.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.487154,40.605888]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p31 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"22"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2422.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2978.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"212.3,5400.0 817.5,5400.0 811.5,4769.5 3854.0,4735.0 3835.7,3098.9 3601.4,3101.8 3619.4,2857.6 3223.9,2864.3 3219.5,2579.9 1875.2,2596.4 1872.6,2446.9 0.0,2436.0 -0.0,5400.0 123.7,5400.0 111.7,4308.1 496.0,4303.9 498.2,4771.7 206.2,4774.1 212.3,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2016.0,3681.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4901287,40.5971442]}},{"type":"Feature","properties":{"resourceCoords":[788.0,2609.9],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.492908,40.597991]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p31 [2]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"19"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2456.4"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0.0,0.0 0.0,2436.0 286.2,2437.7 289.3,2173.0 2481.7,2199.1 2480.5,2295.9 2996.9,2296.8 2996.0,2421.7 4064.3,2188.1 4078.2,745.0 4352.0,747.7 4352.0,-0.0 0.0,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0031__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1772.0,1672.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.495829,40.609184]}},{"type":"Feature","properties":{"resourceCoords":[1772.0,1056.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.496213,40.60998]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0032/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p32","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"8"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0032/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0032/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5400.0 -0.0,-0.0 384.5,0.0 381.5,468.3 89.4,467.5 88.6,1094.1 694.0,1100.8 695.0,469.5 3739.0,468.4 3735.6,3122.0 4352.0,3117.0 4352.0,5400.0 -0.0,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0032/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[692.0,2184.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4904923,40.5929067]}},{"type":"Feature","properties":{"resourceCoords":[3736.0,1320.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4857753,40.595483]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0033/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p33","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"22"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0033/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0033/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3783.0,86.1 3735.3,5322.2 4352.0,5327.8 4352.0,5400.0 275.8,5400.0 325.4,61.9 3783.0,86.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0033/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3348.0,1792.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.483166,40.596205]}},{"type":"Feature","properties":{"resourceCoords":[2740.0,3512.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4831399,40.5949395]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0034/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p34","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0034/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0034/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3888.3,167.8 3898.9,1884.5 4352.0,1883.9 4352.0,5400.0 -0.0,5400.0 -0.0,183.8 3888.3,167.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0034/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3280.0,1152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4802067,40.5975585]}},{"type":"Feature","properties":{"resourceCoords":[208.0,940.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4829208,40.5969725]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p35 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"3037.2"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1057.6,2985.7 1236.4,3036.8 1234.8,3037.2 1236.8,3036.8 1868.0,2932.8 2488.0,2943.2 2630.8,2946.0 3202.4,2955.6 3205.6,2710.0 3206.4,2653.2 4043.2,2636.0 4352.0,2637.2 4352.0,2634.0 4352.0,1994.3 3769.4,1913.0 3777.5,554.5 3338.0,310.8 616.0,308.1 616.0,2004.8 1063.7,2007.0 1057.6,2985.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[616.0,2004.8],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4794456,40.5972251]}},{"type":"Feature","properties":{"resourceCoords":[616.0,308.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4799881,40.5983462]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035__3/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p35 [3]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"5"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2740.4"},{"label":"split_canvas_w","value":"3202.4"},{"label":"split_canvas_h","value":"2659.6"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035__3/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2226.0,5400.0 2247.5,5296.3 2630.6,5311.8 2832.4,5208.4 2978.2,4972.7 3189.5,4036.5 3202.4,2955.6 2630.8,2946.0 2488.0,2943.2 1868.0,2932.8 1236.8,3036.8 1234.8,3037.2 1236.4,3036.8 974.7,2962.0 974.2,2969.1 0.0,2742.7 360.7,3084.2 45.2,4479.5 626.0,4694.9 470.9,5400.0 2226.0,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0035__3/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[179.9,3876.2],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.476916,40.5984405]}},{"type":"Feature","properties":{"resourceCoords":[3018.5,4808.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4743664,40.5989366]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p38 [1]","metadata":[{"label":"streets","value":"4"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2572.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"305.7,1386.2 315.5,2177.4 4057.8,640.9 4040.0,444.0 1784.1,486.7 1787.8,1360.7 305.7,1386.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1788.0,1720.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4609494,40.602946]}},{"type":"Feature","properties":{"resourceCoords":[4040.0,444.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4592736,40.6043764]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p38 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"1051.2"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"4348.8"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,3221.9 -0.0,5400.0 1611.2,5400.0 2904.0,3258.0 4352.0,3262.0 4352.0,3142.0 4352.0,1524.4 2630.3,2462.9 -0.0,3221.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0038__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3688.0,1850.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4572,40.605614]}},{"type":"Feature","properties":{"resourceCoords":[280.0,2698.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4592736,40.6043764]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0039/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p39","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0039/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0039/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2361.4,178.5 3003.5,166.7 3673.2,1420.7 3702.1,2687.7 2435.5,5270.4 1533.4,5276.9 834.8,2753.4 810.8,1483.5 2361.4,178.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0039/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49274386070206,40.602205435862345]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49397692037076,40.60497651780625]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48948010883522,40.60614639027707]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48824704916653,40.60337530833316]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0004/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p4","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0004/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0004/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"189.5,339.1 1888.0,308.0 1886.8,0.0 2098.2,0.0 2098.5,764.1 4352.0,753.2 4352.0,5400.0 -0.0,5400.0 -0.0,5164.3 184.5,5163.3 645.8,4699.6 643.4,4290.6 162.1,3797.1 189.5,339.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0004/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1888.0,308.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4647629,40.6025366]}},{"type":"Feature","properties":{"resourceCoords":[188.0,1132.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4660206,40.6015693]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0040/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p40","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"21"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0040/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0040/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2674.9,4833.6 -0.0,4820.9 -0.0,1215.0 275.3,1213.4 281.1,592.1 3927.5,611.5 3897.1,4840.2 3464.1,4837.9 3461.1,5400.0 2674.1,5400.0 2674.9,4833.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0040/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2704.0,2716.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.48936,40.600549]}},{"type":"Feature","properties":{"resourceCoords":[1476.0,4828.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4897495,40.598862]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0041/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p41","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0041/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0041/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"40.2,4836.0 88.4,423.2 497.8,515.2 510.9,-0.0 978.5,-0.0 978.5,-0.0 4352.0,-0.0 4352.0,1047.2 3885.1,1046.6 3883.9,1252.2 4352.0,1536.7 4277.6,4867.4 40.2,4836.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0041/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45769983145136,40.61089944763213]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45631644748228,40.60805748981426]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46092887180815,40.606745166457195]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46231225577723,40.609587124275066]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0042/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p42","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0042/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0042/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4193.2,274.8 4253.0,5400.0 34.0,5400.0 1.9,333.9 4193.2,274.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0042/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4615304548971,40.609775885842936]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46021036950164,40.60688131499354]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46490810092529,40.60562901674601]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46622818632075,40.60852358759541]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0044/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p44","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0044/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0044/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4178.9,1149.4 4352.0,1147.7 4352.0,5400.0 2172.4,5400.0 2254.4,4987.0 67.6,5005.7 -0.0,777.6 4254.0,737.1 4178.9,1149.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0044/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46144188183146,40.61350562743679]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45770300286976,40.61448761555688]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45610918089797,40.610940971729335]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45984805985967,40.60995898360924]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0046/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p46","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0046/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0046/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"723.6,999.4 3637.1,1011.2 3616.1,1494.4 4310.9,1494.4 4352.0,5400.0 3322.0,5400.0 3401.5,4993.6 608.7,4992.7 723.6,999.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0046/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2772.0,3036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4587276,40.6151284]}},{"type":"Feature","properties":{"resourceCoords":[700.0,2048.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.460842,40.6152941]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0047/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p47","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"18"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0047/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0047/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"843.2,4881.8 893.2,618.5 3741.8,681.9 3700.8,4893.0 843.2,4881.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0047/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2660.0,2752.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4790262,40.6065521]}},{"type":"Feature","properties":{"resourceCoords":[876.0,2020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4807913,40.6065967]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0048/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p48","metadata":[{"label":"streets","value":"10"},{"label":"intersections","value":"23"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0048/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0048/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"512.2,4778.2 479.5,620.6 3693.6,578.7 3721.6,4752.0 512.2,4778.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0048/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2052.0,4768.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.476105,40.6057759]}},{"type":"Feature","properties":{"resourceCoords":[2636.0,592.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4768797,40.6086855]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0049/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p49","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"13"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0049/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0049/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"697.0,4780.7 667.5,580.6 3932.0,588.0 3946.2,4784.6 697.0,4780.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0049/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[692.0,2676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4724326,40.608361]}},{"type":"Feature","properties":{"resourceCoords":[3932.0,588.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4702853,40.6104966]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0005/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p5","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"27"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0005/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0005/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"442.1,4732.0 467.6,1463.8 -0.0,1460.7 49.2,409.7 4118.0,430.9 4078.7,4757.3 442.1,4732.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0005/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2284.0,3676.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4850504,40.5977403]}},{"type":"Feature","properties":{"resourceCoords":[2900.0,428.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.485558,40.600018]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0050/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p50","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0050/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0050/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"489.7,4881.4 513.8,681.2 3661.3,707.2 3624.3,4910.3 489.7,4881.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0050/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2292.0,2780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4680862,40.6095572]}},{"type":"Feature","properties":{"resourceCoords":[492.0,3832.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4692983,40.6084341]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0051/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p51","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"8"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0051/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0051/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"513.7,901.9 4225.9,936.3 4200.4,5025.0 484.6,4999.9 513.7,901.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0051/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[4232.0,2916.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4636823,40.6107687]}},{"type":"Feature","properties":{"resourceCoords":[1064.0,820.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4670952,40.6113775]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0052/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p52","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0052/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0052/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"374.0,5004.4 291.3,773.7 3919.5,708.3 3992.8,4909.9 374.0,5004.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0052/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[328.0,2236.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.463886,40.611178]}},{"type":"Feature","properties":{"resourceCoords":[2392.0,3896.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4615992,40.6105441]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0053/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p53","metadata":[{"label":"streets","value":"12"},{"label":"intersections","value":"23"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0053/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0053/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5400.0 -0.0,-0.0 536.5,0.0 522.2,761.3 4152.3,784.6 4126.4,4756.4 509.5,4730.4 504.2,5400.0 -0.0,5400.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0053/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3572.0,1396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.493957,40.606518]}},{"type":"Feature","properties":{"resourceCoords":[4148.0,1396.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.493457,40.606658]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0054/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p54","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"23"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0054/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0054/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1557.4,4735.6 1550.3,4102.6 334.0,4118.7 314.9,746.0 3980.0,712.0 4002.8,4710.6 1557.4,4735.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0054/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[332.0,3416.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.492818,40.605313]}},{"type":"Feature","properties":{"resourceCoords":[3980.0,712.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.49049,40.607935]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p55 [1]","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"2739.2"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2660.8"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4213.8,5225.6 4181.2,2771.9 3057.7,2763.1 1757.8,3068.1 1755.7,2822.6 552.0,2839.1 561.2,5275.1 4213.8,5225.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2988.0,4029.6],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.491918,40.608443]}},{"type":"Feature","properties":{"resourceCoords":[552.0,2839.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.494396,40.608669]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p55 [2]","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"6"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2773.2"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"489.5,1909.7 485.9,2681.5 4164.0,2653.1 4163.8,194.0 4352.0,192.1 4352.0,0.0 3548.0,0.0 3080.0,0.0 824.0,0.0 -0.0,-0.0 -0.0,1916.6 489.5,1909.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0055__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2948.0,2653.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4946961,40.6067815]}},{"type":"Feature","properties":{"resourceCoords":[4164.0,2653.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.493649,40.607062]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0056/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p56","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0056/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0056/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4215.9,4948.5 134.3,4958.2 136.4,462.0 4208.2,431.0 4215.9,4948.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0056/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48214298454769,40.61033489443406]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48081575643607,40.60752181988867]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48538126556076,40.60626275722973]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48670849367238,40.60907583177512]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0057/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p57","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"34"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0057/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0057/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1808.2,5160.4 1807.4,5400.0 1616.8,5400.0 810.7,2838.9 942.5,2715.4 775.6,2722.5 19.5,298.3 4259.3,267.0 4305.5,5132.8 1808.2,5160.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0057/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3628.0,1488.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.487543,40.609224]}},{"type":"Feature","properties":{"resourceCoords":[1836.0,2716.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.489152,40.6101169]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0058/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p58","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0058/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0058/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4165.3,5201.7 96.5,5199.2 107.4,220.0 4202.3,218.9 4165.3,5201.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0058/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4861415409484,40.609212568230085]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48481086101027,40.60641080763546]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.48935793328275,40.60514844967987]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.49068861322087,40.60795021027449]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0059/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p59","metadata":[{"label":"streets","value":"16"},{"label":"intersections","value":"31"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0059/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0059/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"584.8,0.0 4352.0,0.0 4352.0,4553.5 4156.3,4515.5 4148.2,3328.9 3698.9,3330.2 3720.3,5157.6 365.4,5183.5 338.0,957.8 586.3,880.2 584.8,0.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0059/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1932.0,3356.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.485495,40.610661]}},{"type":"Feature","properties":{"resourceCoords":[4144.0,908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4843262,40.6127892]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0006/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p6","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"16"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0006/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0006/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"368.5,376.3 4352.0,379.1 4352.0,4712.2 341.1,4703.1 368.5,376.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0006/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1556.0,4708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4821048,40.5977575]}},{"type":"Feature","properties":{"resourceCoords":[2792.0,372.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.482414,40.6008991]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0060/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p60","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"35"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0060/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0060/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2492.4,122.5 3936.9,129.4 3906.9,5032.0 -0.0,5015.1 -0.0,3180.0 451.1,3184.0 445.2,4375.5 641.3,4416.0 684.2,752.3 2490.3,744.8 2492.4,122.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0060/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1772.0,4392.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4820619,40.6107221]}},{"type":"Feature","properties":{"resourceCoords":[1060.0,2568.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4832503,40.6117434]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0061/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p61","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"19"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0061/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0061/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4352.0,4909.3 273.5,4893.1 292.9,3397.6 -0.0,3484.3 -0.0,0.0 4352.0,0.0 4352.0,4909.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0061/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2364.0,2788.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4803628,40.6159768]}},{"type":"Feature","properties":{"resourceCoords":[1324.0,4384.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4807705,40.6146331]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0062/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p62","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"30"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0062/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0062/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"220.2,5035.9 270.7,182.9 3929.2,215.8 3880.5,5054.3 220.2,5035.9\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0062/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3916.0,2020.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.477787,40.613708]}},{"type":"Feature","properties":{"resourceCoords":[1336.0,1408.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4802222,40.6134801]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0063/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p63","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"16"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0063/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0063/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3770.2,4679.0 921.7,4597.8 965.0,577.2 3831.4,623.3 3770.2,4679.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0063/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2344.0,2632.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4806442,40.6091429]}},{"type":"Feature","properties":{"resourceCoords":[1672.0,576.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.481887,40.610314]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0064/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p64","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"15"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0064/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0064/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3475.3,4703.7 713.1,4737.0 683.2,663.1 3491.4,625.5 3475.3,4703.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0064/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3476.0,3708.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4766963,40.6094727]}},{"type":"Feature","properties":{"resourceCoords":[700.0,2704.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4793877,40.6094873]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0065/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p65","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"24"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0065/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0065/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4277.4,4777.4 1473.6,4780.5 1311.9,4016.1 80.9,4021.2 92.7,5400.0 -0.0,5400.0 -0.0,0.0 1279.3,-0.0 1281.8,733.7 1636.3,732.4 2029.4,-0.0 3051.7,-0.0 3053.0,578.5 4284.5,582.0 4277.4,4777.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0065/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3640.0,3112.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4727452,40.6169067]}},{"type":"Feature","properties":{"resourceCoords":[3644.0,580.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.470551,40.617506]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0066/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p66","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0066/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0066/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5391.2 -0.0,-0.0 1253.9,-0.0 1411.8,783.3 4267.7,791.9 4217.2,5392.6 -0.0,5391.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0066/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47465025846054,40.619032161268215]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47329612442122,40.61622445551726]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47785351327455,40.61494003596733]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.47920764731387,40.61774774171828]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0067/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p67","metadata":[{"label":"streets","value":"13"},{"label":"intersections","value":"33"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0067/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0067/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"992.2,5196.0 926.5,291.2 3830.2,254.6 3894.4,5146.1 992.2,5196.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0067/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[956.0,2120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.477787,40.613708]}},{"type":"Feature","properties":{"resourceCoords":[2292.0,2732.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.476451,40.613609]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0068/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p68","metadata":[{"label":"streets","value":"15"},{"label":"intersections","value":"47"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0068/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0068/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"512.9,5132.8 538.2,264.6 3792.4,284.8 3761.6,5150.1 512.9,5132.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0068/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2064.0,1500.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4741561,40.6151378]}},{"type":"Feature","properties":{"resourceCoords":[3248.0,3928.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.47237,40.613832]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0069/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p69","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0069/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0069/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3957.9,4787.1 680.5,4775.3 709.3,711.2 3970.2,719.0 3957.9,4787.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0069/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1336.0,716.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4738077,40.6125339]}},{"type":"Feature","properties":{"resourceCoords":[3964.0,2780.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4709053,40.6118082]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1034.5,4689.0 1031.1,406.3 3852.0,412.0 3846.6,1137.1 4352.0,1135.6 4352.0,4699.8 1034.5,4689.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[3844.0,4696.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.47723,40.599108]}},{"type":"Feature","properties":{"resourceCoords":[3852.0,412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4785964,40.6019534]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0070/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p70","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"17"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0070/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0070/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"545.8,4742.3 549.3,690.4 3660.8,697.1 3690.7,4737.0 545.8,4742.3\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0070/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2324.0,2740.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4693717,40.6122296]}},{"type":"Feature","properties":{"resourceCoords":[3684.0,4152.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4677579,40.6116245]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0071/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p71","metadata":[{"label":"streets","value":"14"},{"label":"intersections","value":"36"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0071/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0071/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3831.4,5073.1 751.7,5021.8 827.2,207.0 3917.8,251.5 3831.4,5073.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0071/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1900.0,3844.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.47093,40.614216]}},{"type":"Feature","properties":{"resourceCoords":[1404.0,216.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4725456,40.616484]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0072/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p72","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0072/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0072/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"159.8,939.1 4195.5,910.9 4210.3,0.0 4352.0,0.0 4352.0,3086.2 3697.3,3771.6 3512.0,4541.5 160.3,4546.9 159.8,939.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0072/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[164.0,3348.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.469223,40.614685]}},{"type":"Feature","properties":{"resourceCoords":[1204.0,932.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4690641,40.6165418]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0073/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p73","metadata":[{"label":"streets","value":"11"},{"label":"intersections","value":"21"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0073/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0073/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4305.4,776.7 4284.2,5102.5 285.8,5062.2 285.9,634.3 4305.4,776.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0073/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2336.0,3124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4626529,40.614054]}},{"type":"Feature","properties":{"resourceCoords":[284.0,3124.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4632983,40.6153985]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0074/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p74","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0074/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0074/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"173.3,4945.4 184.3,370.7 4245.9,373.7 4248.7,1085.0 4352.0,1087.1 4352.0,4892.6 173.3,4945.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0074/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46471350190335,40.615138946356865]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46339929605949,40.612319544543396]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46797540324066,40.611072925011364]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46928960908451,40.61389232682483]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0075__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p75 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"9"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0075__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0075/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,5146.8 3988.0,5120.0 4032.7,3291.8 3964.0,2748.9 3744.8,2808.2 3748.1,1221.8 4352.0,1220.5 4352.0,0.0 845.7,0.0 853.3,3665.2 389.4,4102.9 1740.0,4126.8 1740.0,4835.6 1740.0,4838.4 1740.0,4913.2 1064.0,4872.0 552.0,4840.8 9.7,4841.6 -0.0,4862.3 -0.0,5146.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0075__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[692.0,1452.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4664445,40.6172648]}},{"type":"Feature","properties":{"resourceCoords":[3988.0,5120.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4624776,40.6156268]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0076/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p76","metadata":[{"label":"streets","value":"0"},{"label":"intersections","value":"0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0076/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0076/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3862.8,5153.1 2051.6,5112.2 1513.5,5181.8 1571.8,5400.0 -0.0,5400.0 -0.0,0.0 4352.0,-0.0 4352.0,699.5 3868.0,680.5 3862.8,5153.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0076/gcps","type":"FeatureCollection","transformation":{"type":"polynomial","options":{"order":1}},"features":[{"type":"Feature","properties":{"resourceCoords":[0.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45920185171921,40.61939280381006]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,0.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.45786577700332,40.616512374713466]}},{"type":"Feature","properties":{"resourceCoords":[4352.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.46254123000071,40.61524509061471]}},{"type":"Feature","properties":{"resourceCoords":[0.0,5400.0],"type":"corner"},"geometry":{"type":"Point","coordinates":[-75.4638773047166,40.6181255197113]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p77 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"15"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"986.8"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"4413.2"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4184.0,5172.1 4206.9,4258.2 4349.2,4259.4 4351.0,2137.7 0.0,988.4 -0.0,1338.7 726.2,1731.5 722.7,2746.4 148.0,2745.7 131.2,5164.9 4184.0,5172.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[148.0,2745.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4707349,40.6178953]}},{"type":"Feature","properties":{"resourceCoords":[4184.0,5172.1],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4664445,40.6172648]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p77 [2]","metadata":[{"label":"streets","value":"5"},{"label":"intersections","value":"4"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"4352.0"},{"label":"split_canvas_h","value":"2138.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2191.3,1400.4 3540.2,1799.6 3982.3,350.6 -0.0,385.5 -0.0,473.1 586.1,651.0 448.0,1106.7 2145.8,1555.2 2191.3,1400.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0077__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2192.0,1401.3],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4827892,40.6136846]}},{"type":"Feature","properties":{"resourceCoords":[3540.0,1797.7],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4815438,40.6140262]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078__1/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p78 [1]","metadata":[{"label":"streets","value":"9"},{"label":"intersections","value":"20"},{"label":"split_canvas_x","value":"0.0"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2982.4"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078__1/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2009.2,2771.6 2140.3,2649.4 1974.7,2656.0 1153.9,-0.0 -0.0,0.0 -0.0,4863.1 -0.0,5400.0 2828.5,5400.0 2009.2,2771.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078__1/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1974.9,2656.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.489481,40.610812]}},{"type":"Feature","properties":{"resourceCoords":[575.7,868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4883572,40.6121575]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078__2/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p78 [2]","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"},{"label":"split_canvas_x","value":"1424.8"},{"label":"split_canvas_y","value":"0.0"},{"label":"split_canvas_w","value":"2927.2"},{"label":"split_canvas_h","value":"5400.0"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078__2/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2804.8,3250.2 2822.4,3250.0 2828.7,4259.9 3006.3,4843.5 4352.0,4842.4 4352.0,1364.0 4352.0,411.1 2804.4,412.0 2804.8,3250.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0078__2/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2804.4,412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.481224,40.6075143]}},{"type":"Feature","properties":{"resourceCoords":[4204.0,412.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4807913,40.6065967]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007A/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7A","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007A/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007A/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4179.2,5014.1 -0.0,5011.4 -0.0,614.9 4188.5,615.7 4179.2,5014.1\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007A/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1964.0,5036.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.479836,40.599997]}},{"type":"Feature","properties":{"resourceCoords":[1964.0,604.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4779115,40.6005285]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007B/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7B","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007B/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007B/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1469.2,4905.4 1452.8,505.2 3979.5,573.7 4028.0,4898.5 1469.2,4905.4\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007B/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1548.0,588.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4781051,40.6020807]}},{"type":"Feature","properties":{"resourceCoords":[452.0,4908.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4779115,40.6005285]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007C/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7C","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"11"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007C/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007C/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"3940.0,556.0 3937.7,382.6 4352.0,381.6 4352.0,2748.4 3386.7,2765.5 3382.8,4008.1 1421.0,4463.4 1378.4,568.8 3940.0,556.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007C/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[1492.0,4896.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.476756,40.599237]}},{"type":"Feature","properties":{"resourceCoords":[3940.0,556.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4763612,40.6009522]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007D/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7D","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007D/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007D/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"1624.6,4899.6 1682.0,531.8 2280.1,530.8 2280.1,1320.8 4352.0,1307.4 4352.0,4869.9 1624.6,4899.6\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007D/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2280.0,2756.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4758009,40.6019279]}},{"type":"Feature","properties":{"resourceCoords":[2280.0,4900.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4767188,40.601679]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007E/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7E","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"13"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007E/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007E/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4437.5 -0.0,522.4 4208.7,477.8 4352.0,2879.2 2866.4,3228.8 3377.5,5400.0 2129.9,5400.0 2109.6,4430.9 -0.0,4437.5\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007E/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2076.0,2724.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4751122,40.6004859]}},{"type":"Feature","properties":{"resourceCoords":[2076.0,504.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4741519,40.6007417]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007F/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7F","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007F/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007F/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"328.0,2732.0 1722.7,2731.9 1725.0,-0.0 4352.0,-0.0 4352.0,5400.0 2254.9,5400.0 2259.5,4688.9 318.3,4679.8 328.0,2732.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007F/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[328.0,2732.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4742536,40.6031391]}},{"type":"Feature","properties":{"resourceCoords":[4296.0,2732.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4735673,40.6017094]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007G/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7G","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007G/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007G/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"-0.0,4899.2 14.0,1117.7 2123.2,1076.5 2115.7,576.6 4352.0,527.1 4261.2,4830.3 -0.0,4899.2\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007G/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2148.0,2748.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4732247,40.6009843]}},{"type":"Feature","properties":{"resourceCoords":[2148.0,4868.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4741519,40.6007417]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007H/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7H","metadata":[{"label":"streets","value":"8"},{"label":"intersections","value":"9"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007H/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007H/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"0,5400 0,0 4352,0 4352,5400 0,5400\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007H/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[220.0,4980.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4730124,40.6050565]}},{"type":"Feature","properties":{"resourceCoords":[4196.0,540.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4704325,40.6041814]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007I/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7I","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007I/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007I/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"2144.0,4860.0 1.9,4896.6 -0.0,3588.6 -0.0,1714.3 -0.0,435.7 4250.0,408.0 4258.0,1682.0 4268.1,3503.9 2144.0,4860.0\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007I/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2144.0,2648.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4736306,40.6040887]}},{"type":"Feature","properties":{"resourceCoords":[2144.0,4860.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4745812,40.6038325]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007J/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p7J","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"10"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007J/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007J/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4352.0,4036.7 265.7,3944.0 252.0,2668.0 -0.0,2670.8 -0.0,1093.5 252.2,442.3 4352.0,387.5 4352.0,4036.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0007J/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[252.0,2668.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4723467,40.603661]}},{"type":"Feature","properties":{"resourceCoords":[252.0,484.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4714082,40.6039104]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0008/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p8","metadata":[{"label":"streets","value":"6"},{"label":"intersections","value":"12"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0008/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0008/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4257.0,519.7 4208.8,4894.1 2112.0,4900.0 2109.7,5400.0 -0.0,5400.0 -0.0,481.3 4257.0,519.7\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0008/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2112.0,4900.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4722799,40.6012435]}},{"type":"Feature","properties":{"resourceCoords":[2136.0,484.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4703582,40.6017694]}}]}},{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0009/georef","type":"Annotation","@context":["http://iiif.io/api/extension/georef/1/context.json","http://iiif.io/api/presentation/3/context.json"],"label":"Allentown, Pennsylvania | 1957 | sanborn07494_007 p9","metadata":[{"label":"streets","value":"7"},{"label":"intersections","value":"11"}],"created":"2026-09-21T16:32:58Z","modified":"2026-09-21T16:32:58Z","motivation":"georeferencing","target":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0009/selector","type":"SpecificResource","source":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0009/info.json","type":"ImageService2","height":5400,"width":4352},"selector":{"type":"SvgSelector","value":"<svg><polygon points=\"4352.0,597.8 4216.9,4753.4 299.5,4876.1 270.6,4007.5 -0.0,3616.6 -0.0,2742.8 230.2,2736.0 168.5,713.0 4352.0,597.8\" /></svg>"}},"body":{"id":"https://tile.loc.gov/image-services/iiif/service:gmd:gmd382m:g3824m:g3824am:g3824am_g07494195701:07494_01_1957-0009/gcps","type":"FeatureCollection","transformation":{"type":"helmert"},"features":[{"type":"Feature","properties":{"resourceCoords":[2284.0,2688.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4701043,40.6034815]}},{"type":"Feature","properties":{"resourceCoords":[300.0,4916.0],"type":"gcp"},"geometry":{"type":"Point","coordinates":[-75.4714082,40.6039104]}}]}}]}