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).
Publisher: Govt. print. off.
Published: 1921
Place of publication: Washington
Language: eng
Number of pages: 48
Subjects: Coal mines and mining -- United States.
Notes: At head of title: Department of the interior. Albert B. Fall, secretary. Bureau of mines. H. Foster Bain, director.
Running title: Operating regulations for coal mines.