APA (7th ed.) Citation

United States. Bureau of Mines. (1936). Sand and gravel excavation: Pt. 6, Mining methods. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Sand and Gravel Excavation: Pt. 6, Mining Methods. [Washington]: [s.n.], 1936.

MLA (9th ed.) Citation

United States. Bureau of Mines. Sand and Gravel Excavation: Pt. 6, Mining Methods. [s.n.], 1936.