APA (7th ed.) Citation

United States. Bureau of Mines. (1921). Hot high-nitrogen gas in metal mine. [publisher not identified].

Chicago Style (17th ed.) Citation

United States. Bureau of Mines. Hot High-nitrogen Gas in Metal Mine. [Washington]: [publisher not identified], 1921.

MLA (9th ed.) Citation

United States. Bureau of Mines. Hot High-nitrogen Gas in Metal Mine. [publisher not identified], 1921.

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