A.M.S. (Series) ; L751. "Fifth Edition-AMS (FEC)". Transverse Mercator projection. "Prepared under the direction of the Chief of Engineers by the Army Map Service (TV), U.S. Army, Washington, D.C. Compiled in 1946 from Korea, 1:50,000, Japanese Imperial Land Survey, Kyongsong, 1932; Japanese Hydrographic Charts 326, 1946.... Planimetric detail revised from aerial photography dated 1950, by photo-planimetric methods, by the 64th Engineer Base Topographic Battalion.... Major roads classified from information furnished by CE, Eighth U.S. Army in Korea, 1951."