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Stanford Geospatial Center. (2023). 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) | 1:500,000 Tōbu kokkyō kinbō zu, Maps Index. [Shapefile]. Stanford Digital Repository. Retrieved from https://geodata.lib.berkeley.edu/catalog/stanford-ny930by1774