A.M.S. (Series) ; L751. "AMS 3". Transverse Mercator projection. "Prepared under the direction of the Chief of Engineers by the Army Map Service (AM), U.S. Army, Washington, D.C. Compiled in 1946 from Korea. 1:50,000, Japanese Imperial Land Survey, Changsaengp'o-dong, 1927. Japanese Hydrographic Charts No. 338, 1935; No. 305, 1934. Planimetric detail partially revised from aerial photography by photo-planimetric methods. Aerial photography by U.S. Army Air Force, 1944-45.... Universal Transverse Mercator Grid values revised, 1950."