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1931
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11. 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...
12. 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.
13. Scotland burghs and districts, 1931
1931. GBHGIS, University of Portsmouth, Research Project. These are digital boundaries for the system of burghs and districts of county essentially created by the Local Government (Scotland) Act 1929 and c...