Army Map Service, Corps of Engineers, Dept. of the Army,
Terrain and permafrost : Umiat Area, Alaska
Permafrost program progress report ;
Black, Robert Foster, 1918-
Barksdale, William L.
United States. Army. Corps of Engineers.
Geological Survey (U.S.). Military Geology Branch.
prepared by Robert F. Black and William L. Barksdale ; Military Geology Section, U.S. Geological Survey ; in cooperation with Research and Analysis Branch, Engineer Intelligence Division, Office, Chief of Engineers.
