United States Army in the world war 1917-1919 / Department of the Army, Historical Division annual reports / war department Report of the Chief of Engineers U.S. Army department of the army technical manual Semitrailer, low bed: 15-ton, 4-wheel M172 (2330-735-9326) ; Semitrailer, low bed: 25-ton, 4-wheel M172A1 (2330-317-6448)
