1918. Stanford Geospatial Center. This polygon shapefile is an index to 1:200,000 scale maps of Korea, titled 'Chōsen nijūmanbun no ichi zu, 朝鮮二十萬分一圖.' This map series was originall... Stanford Digital Repository.
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1914, 1915, 1916, 1917, and 1918. Stanford Geospatial Center. This polygon shapefile is an index to 1:50,000 scale maps of Korea, titled 'Chosen 1:50,000 Chikeizu/Chosen 1:50,000 Chikeizu.’ This map series was... Stanford Digital Repository.