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).

Bibliographic Details
Corporate Author:	United States. Bureau of Mines
Format:	Government Document eBook
Language:	English
Published:	Washington : U.S. GPO, 1923.
Subjects:	United States. > Bureau of Mines. Coal mines and mining. Mine accidents. Mine safety. Electronic books.
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