APA (7th ed.) Citation

United States. Bureau of Mines. (1939). Some suggestions on safety in timbering anthracite mines. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Some Suggestions on Safety in Timbering Anthracite Mines. [Washington]: [s.n.], 1939.

MLA (9th ed.) Citation

United States. Bureau of Mines. Some Suggestions on Safety in Timbering Anthracite Mines. [s.n.], 1939.