APA (7th ed.) Citation

United States. Bureau of Mines. (1938). PowerƯshovel and dragline placer mining. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. PowerƯshovel and Dragline Placer Mining. [Washington]: [s.n.], 1938.

MLA (9th ed.) Citation

United States. Bureau of Mines. PowerƯshovel and Dragline Placer Mining. [s.n.], 1938.

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