1. 二百万分一大東亜航空圖 -- 1:2,000,000 Daitōa Kōkūzu, Maps Index Datasets Stanford University Public content 1943 and 1944. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '二百万分一大東亜航空圖 -- 1:2,000,000 Daitōa Kōkūzu.' This map series was originally produced by the Ja... Stanford Digital Repository.