1943. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '[東「ソ」/ 滿洲 / 東「ソ」外蒙古] 五十万分一圖 | 五十万分一地誌圖 -- 1:500,000 chishizu.' This map series was original... Stanford Digital Repository.
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1939 and 1940. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '蘇満方面五十万分一地誌圖 -- Soman hōmen chishizu 1:500,000.' This map series was originally produced by ... Stanford Digital Repository.