A.M.S. (Series) ; L751. "AMS 4". Polyhedral projection. "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, Yonghodo-ri, 1926.... Universal Transverse Mercator Grid added, 1950." "Planimetric detail revised from aerial photography dated 1947 by photo-planimetric methods by the 64th Engineer Base Topographic Battalion." Portion of map's lower edge lacking, cropping some marginal content. On verso: sheet 6927 IV, Pukpun, from Korea 1:50,000 set.