APA (7th ed.) Citation

United States. Bureau of Mines. (1939). Bureau of Mines midget impinger. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Bureau of Mines Midget Impinger. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Mines. Bureau of Mines Midget Impinger. [s.n.], 1939.

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