00996cam a22002651 4500 gs 38000127 DLC 20260227111343.0 740129s1938 dcu 000 0 eng gs 38000127 (OCoLC)785160 DLC N OCoLC DLC premarc TN23 .U75 1938 United States. Geological survey. 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. Second edition. Washington, U.S. Govt. print. off., 1938. ii, 46 p. 23 cm. At head of title: United States Department of the interior. Coal mines and mining United States. Coal mines and mining Safety measures. Public lands United States. Mining law United States. 27439 27439