1943 and 1944. Stanford Geospatial Center. This polygon shapefile is an index to 1:2,000,000 scale maps of East Asia, Southeast Asia, Alaska, titled '二百万分一大東亜航空圖 - Nihyakumanbunnoichi Daitōa... Stanford Digital Repository.
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1944. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '[北沿極帶 / 北沿赤道帶 / 赤道帶] 百万分一航空圖 -- 1:1,000,000 Kōkūzu.' This map series was originally produced... Stanford Digital Repository.
1944. Stanford Geospatial Center. This polygon shapefile is an index to 1:1,000,000 scale maps of Southeast Asia and Australia, titled 'Hyakumanbun no ichi kōkūzu.’ To create this i...
1941, 1942, 1943, and 1944. Stanford Geospatial Center. This polygon shapefile is an index to 1:2,000,000 scale maps of Southeast Asia, titled 'Nihyakumanbunnoichi Nanpōzu -- 二百万分一南方圖.’ This map series w... Stanford Digital Repository.