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2023. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '極東「ソ」領飛行場一覧圖 (黒河地方) | 五十万分一黒河地方素圖 -- Kyokutō "So" ryō hikōjō ichiran zu (Kokuga chihō) | 1:5... Stanford Digital Repository.
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.
2023. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '極東「ソ」領飛行場一覧圖 (ザバイカル) | 五十万分一後貝加爾方面素圖 -- Kyokutō "So" ryō hikōjō ichiran zu (Zabaikaru) | 1:5... Stanford Digital Repository.