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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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.