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Stanford Geospatial Center. (2023). [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, Maps Index. [Shapefile]. Stanford Digital Repository. Retrieved from https://geodata.lib.berkeley.edu/catalog/stanford-rj240qh2663