A.M.S. (Series) ; L751. "Fifth Edition-AMS (FEC)". Transverse Mercator projection. "Prepared by the Army Map Service (GE), Corps of Engineers, U.S. Army, Washington, D.C. Compiled in 1951 from Korea, 1:50,000, Japanese Imperial Land Survey, Kumsong, 1927.... Aerial photography, Sept., Oct., Nov. 1950.... Road classifications revised in September 1951 by 64th Engineer Base Topographic Battalion from reconnaissance material furnished by Engineer, EUSAK."