1930, 1931, 1932, 1933, 1934, 1935, 1936, 1937, 1938, 1939, 1940, 1941, 1942, and 1943. Stanford Geospatial Center. This polygon shapefile is an index to 1:500,000 scale maps of East Asia, titled 'Gojūmanbun no ichi yochizu .' This map series was originally produ... Stanford Digital Repository.
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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.
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.
1947. Stanford Geospatial Center. This polygon shapefile is an index to 1:25,000 scale maps of Korea, titled '二万五千分一地形圖 - Niman-gosenbun no ichi chikeizu.’ This map series was origi... 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.
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.