APA (7th ed.) Citation

United States. Bureau of Mines. (1941). Open-cut metal mining. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Open-cut Metal Mining. [Washington]: [s.n.], 1941.

MLA (9th ed.) Citation

United States. Bureau of Mines. Open-cut Metal Mining. [s.n.], 1941.

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