United States. Bureau of Mines. (1923). Operating regulations to govern coal-mining methods and safety and welfare of miners on leased lands on public domain, under Act of Feb. 25, 1920 (Public No. 146). U.S. GPO.
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines. Operating Regulations to Govern Coal-mining Methods and Safety and Welfare of Miners on Leased Lands on Public Domain, Under Act of Feb. 25, 1920 (Public No. 146). Washington: U.S. GPO, 1923.
MLA (9th ed.) CitationUnited States. Bureau of Mines. Operating Regulations to Govern Coal-mining Methods and Safety and Welfare of Miners on Leased Lands on Public Domain, Under Act of Feb. 25, 1920 (Public No. 146). U.S. GPO, 1923.
Warning: These citations may not always be 100% accurate.