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1. 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...

2. 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.