1910, 1911, 1912, 1913, 1914, 1915, 1916, and 1917. Stanford Geospatial Center. This polygon shapefile is an index to 1:50,000 scale maps of North Korea, titled 'Chosen 1:50,000 Chikeizu/朝鮮五萬分之一地形圖: 1:50,000 Topo of Korea.'. Th... Stanford Digital Repository.
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1916, 1917, and 1918. Stanford Geospatial Center. This polygon shapefile is an index to 1:50,000 scale maps of North Korea, titled 'Chosen 1:50,000 Chikeizu.' This map series was originally produce... Stanford Digital Repository.