1934, 1935, 1936, 1937, 1938, 1939, 1940, and 1941. Stanford Geospatial Center. This polygon shapefile is an index to 1:500,000 scale maps of South Korea and the Daitō Islands (Japan), titled '五十万分一興地圖 - Gojūmanbun no ichi Yōch... Stanford Digital Repository.
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2023. Stanford Geospatial Center. This polygon shapefile is an index to the map series, '朝鮮交通圖 -- Chōsen kōtsūzu 1:50,00.' This map series was originally produced by the Japanese La... Stanford Digital Repository.
1915, 1916, and 1917. Stanford Geospatial Center. This polygon shapefile is an index to 1:50,000 scale maps of Korea, titled 'Chosen 1:50,000 Chikeizu/朝鮮五萬分之一地形圖: 1:50,000 Topo of Korea. This map s... Stanford Digital Repository.