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1. New York-New Jersey: Ramapo Quadrangle

1931. United States. Geological Survey. This is a scanned historical map of the Ramapo Quadrangle in New York and New Jersey shown at a scale of 1:62,500. This map was created by the US G... US Geological Survey.

2. Nigeria conflated historical administrative boundaries, 1931

1931. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of provinces in Nigeria for 1931. GADM country-level administrative shapefiles were conflated with, an...

3. Nigeria extracted historical administrative boundaries, 1931

1931. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of provinces in Nigeria for 1931. Boundaries were extracted from a scanned British Colonial Office map.