2023. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '極東「ソ」領飛行場一覧圖 (東部國境) | 五十万分一東部國境近傍圖 -- Kyokutō "So" ryō hikōjō ichiran zu (Tōbu kokkyō) | 1:5... Stanford Digital Repository.
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2023. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '滿洲五万分一拜泉克山附近 -- Manshū Haisen Kokusan fukin 1:50,000.' This map series was originally produc... Stanford Digital Repository.