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., by Geological Survey (U.S.)

Title:	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.
Author:	Geological Survey (U.S.)
Note:	U. S. Govt. Print. Off., 1938

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Subject:	Coal mines and mining -- Safety measures
Subject:	Coal mines and mining -- United States
Subject:	Mining law -- United States
Subject:	Public lands -- United States
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