A.M.S. (Series) ; L751. "Type F-AMS 1". Transverse Mercator projection. "Prepared under the direction of the Chief of Engineers by the Army Map Service (PT), War Department, Washington, D.C. Compiled in 1947 from Korea, 1:50,000, Japanese Imperial Land Survey, P'yŏngyang, 1941. Planimetric detail partially revised from aerial photography by photo-planimetric methods. Aerial photography by U.S. Army Air Force, 1944-45. Miscellaneous detail added from Intelligence Report."