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Historic Maps
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Graph
layer:
1850-Boston-Railroad-Crossings-Perkins
https://druid.datalegend.net/IISG/historic-maps/id/layer/1850-Boston-Railroad-Crossings-Perkins
rdf:
type
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
tg:
Layer
https://triplydb.com/Triply/tg/def/Layer
graph:
mapwarper
https://druid.datalegend.net/IISG/historic-maps/graphs/mapwarper