A.M.S. (Series) ; L751. "Type F (AMS 1), 1947". Transverse Mercator projection. "Prepared under the direction of the Chief of Engineers by the Army Map Service (LU), War Department, Washington, D.C. Compiled in 1947 from Korea 1:50,000, Japanese Imperial Land Survey, Sariwon, 1935, Japanese Hydrographic Charts No. 1264, 1931; No. 348 B, 1932. Planimetric detail revised from aerial photography by photo-planimetric methods. Aerial photography by U.S. Army Air Force, 1945."