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).

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Corporate Author: United States. Bureau of Mines.
Language(s): English
Published: Washington, Govt. print. off., 1921.
Subjects: Coal mines and mining > Coal mines and mining / United States.
Physical Description: 48 p. 25 cm.
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