1. [Chosen] Gomanbunnnoichi Chikeizu, Map Index Datasets Stanford University Public content 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.