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. - United States. Geological survey (Washington, U.S. Govt. print. off., 1938)
At head of title: United States Department of the interior.
Keywords: Coal mines and mining -- United States; Coal mines and mining -- Safety measures; Public lands -- United States; Mining law -- United States