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1. Nigeria conflated historical administrative boundaries, 1939

1939. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of regions and provinces in Nigeria for 1939. GADM country-level administrative shapefiles were confla...

2. Nigeria extracted historical administrative boundaries, 1939

1939. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of regions and provinces in Nigeria for 1939. Boundaries were extracted from a scanned British Colonia...