1942 and 1943. Stanford Geospatial Center. This polygon shapefile is an index to 1:200,000 scale maps of Siberia (Russia), East Asia, titled '西伯利兵要二十万分一圖 - Shiberi heiyō nijūmanbun no ichi z... Stanford Digital Repository.
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1942. Stanford Geospatial Center. This polygon shapefile is an index to 1:200,000 scale maps of Mongolia, Manchuria and Siberia, titled '二十万分一地誌圖 - Nijūmanbun no ichi Chishizu.’ Thi... Stanford Digital Repository.