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1939
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1. Ichimanbun no ichi chikeizu Yokohama kinbō, Maps Index
1939. Stanford Geospatial Center. This polygon shapefile is an index to 1:10,000 scale maps of Yokohama (Japan), titled 'Ichimanbun no ichi chikeizu Yokohama kinbō -- 一万分一地形圖横濱近傍.’ ... Stanford Digital Repository.
2. Manshū oyobi Shiberi heiyō nijūmanbun no ichi zu, Maps Index
1939. Stanford Geospatial Center. This polygon shapefile is an index to 1:200,000 scale maps of Manchuria (China), Siberia (Russia), titled '満洲及西伯利兵要二十万分一圖 - Manshū oyobi Shiberi he... Stanford Digital Repository.
3. 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...
4. 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...