Thirty 45 Horse-Power "Caterpillar" Tractors comprising motorized equipment, 9th Field Artillery, Schofield Barracks, Hawaii, 1917. (First motorized artillery regiment in U.S. Army).

Chicago citation style
War Department. 1789-9/18/1947. Thirty 45 Horse-Power "Caterpillar" Tractors comprising motorized equipment, 9th Field Artillery, Schofield Barracks, Hawaii, 1917. (First motorized artillery regiment in U.S. Army).. 1917-01-01/1919-12-31. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/533688. (Accessed July 18, 2018.)
APA citation style
War Department. 1789-9/18/1947, (1917-01-01/1919-12-31) Thirty 45 Horse-Power "Caterpillar" Tractors comprising motorized equipment, 9th Field Artillery, Schofield Barracks, Hawaii, 1917. (First motorized artillery regiment in U.S. Army).. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/533688
MLA citation style
War Department. 1789-9/18/1947. Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/533688>.
Note: These citations are programmatically generated and may be incomplete.