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 (41 Stat. 437) and amendments thereto.
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TextPublication details: Washington, U.S. Govt. print. off., 1938.Edition: Second editionDescription: ii, 46 p. 23 cmSubject(s): LOC classification: - TN23 .U75 1938
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At head of title: United States Department of the interior.
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