APA (7th ed.) Citation

United States. Bureau of Mines. (1923). Mine timber in Pennsylvania coal mines. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Mine Timber in Pennsylvania Coal Mines. [Washington]: [publisher not identified], 1923.

MLA (9th ed.) Citation

United States. Bureau of Mines. Mine Timber in Pennsylvania Coal Mines. [publisher not identified], 1923.