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) United States. Bureau of Mines

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Author
United States. Bureau of Mines
Subjects
Coal mines and mining -- United States.; United States.
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http://trove.nla.gov.au/work/775863
Work ID
775863

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