APA (7th ed.) Citation

United States. Army. Air Corps. (1926). Maine, Portland, commercial landing field. U.S. GPO.

Chicago Style (17th ed.) Citation

United States. Army. Air Corps. Maine, Portland, Commercial Landing Field. Washington: U.S. GPO, 1926.

MLA (9th ed.) Citation

United States. Army. Air Corps. Maine, Portland, Commercial Landing Field. U.S. GPO, 1926.

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