Operating regulations to govern coal-mining methods and the safety and welfare of miners on leased lands on the public domain under the Act of February 25, 1920 (Public no. 146).

APA Citation

United States. Bureau of Mines. (1921). Operating regulations to govern coal-mining methods and the safety and welfare of miners on leased lands on the public domain under the Act of February 25, 1920 (Public no. 146). Washington: Govt. print. off..

MLA Citation

United States. Bureau of Mines. Operating Regulations to Govern Coal-mining Methods And the Safety And Welfare of Miners On Leased Lands On the Public Domain Under the Act of February 25, 1920 (Public No. 146). Washington: Govt. print. off., 1921.