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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1939. Stanford Geospatial Center. This polygon shapefile is an index to 1:200,000 scale maps of Manchuria (China), Siberia (Russia), titled '満洲及西伯利兵要二十万分一圖 - Manshū oyobi Shiberi he... Stanford Digital Repository.