APA (7th ed.) Citation

United States. Army. Air Corps. (1923). Maryland, Hagerstown, emergency. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Maryland, Hagerstown, Emergency. Washington: U.S. GPO, 1923.

MLA (9th ed.) Citation

United States. Army. Air Corps. Maryland, Hagerstown, Emergency. U.S. GPO, 1923.

Warning: These citations may not always be 100% accurate.