A.M.S. (Series) ; L751. "Fifth Edition-AMS (FEC)". Transverse Mercator projection. "Prepared by the Army Map Service (PT), Corps of Engineers, U.S. Army, Washington, D.C. Redrawn in 1946 from Korea, 1:50,000, Japanese Imperial Land Survey, Chonju, 1934.... Planimetric detail revised by photo-planimetric methods from aerial photography, 1947; Sino-Korean characters added, 1951 by the 64th Engineer Base Topographic Battalion."