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.