APA (7th ed.) Citation

United States. Bureau of Mines. (1944). Precautions to be Taken When Approaching Old Mine Workings. [s.n.].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Precautions to Be Taken When Approaching Old Mine Workings. [Washington]: [s.n.], 1944.

MLA (9th ed.) Citation

United States. Bureau of Mines. Precautions to Be Taken When Approaching Old Mine Workings. [s.n.], 1944.

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