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layer:
1850-Boston-Railroad-Crossings-Perkins
https://druid.datalegend.net/IISG/historic-maps/id/layer/1850-Boston-Railroad-Crossings-Perkins
tg:
boundingBox
https://triplydb.com/Triply/tg/def/boundingBox
bbox:
-71.0359_42.4033_42.3334_-71.1003
https://druid.datalegend.net/IISG/historic-maps/id/bbox/-71.0359_42.4033_42.3334_-71.1003
graph:
mapwarper
https://druid.datalegend.net/IISG/historic-maps/graphs/mapwarper