A.M.S. (Series) ; L751. "Fourth Edition-AMS". "Prepared under the direction of the Chief of Engineers by the Army Map Service (CV), U.S. Army, Washington, D.C. Copied in 1945 from Korea 1:50,000, Japanese Imperial Land Survey, Chindong-ni, 1926.... Redrawn and photo revised in 1950 from aerial photography dated 1947 and 1948, by photo-planimetric methods, by the 64th Engineer Base Topographic Battalion."
