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1. Tōa gojūmanbun no ichi zu, Maps Index

1923. Stanford Geospatial Center. This polygon shapefile is an index to 1:500,000 scale maps of East Asia, titled 'Tōa gojūmanbun no ichi zu/東亞五十万分一圖: 1:50,000 Map of East Asia.’ Th... Stanford Digital Repository.

2. British Cameroons conflated historical administrative boundaries, 1923

1923. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of provinces and divisions in British Cameroons for 1923. GADM country-level administrative shapefiles...

3. British Cameroons extracted historical administrative boundaries, 1923

1923. Map and Geospatial Information Center, Lewis Library, Princeton University. Shapefile representing historical boundaries of provinces and divisions in British Cameroons for 1923. Boundaries were extracted from a scanned Bri...