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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Bookitis Pick
OR
Image source: Open LibraryUnited States. Bureau of Mines.First published 19211 editions
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First publish date 19211 credited authorSearch language english
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- Open Author
United States. Bureau of Mines.
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