Hours and earnings in anthracite and bituminous coal mining. Anthracite--1919 and 1920, bituminous--1919. - United States. Bureau of Labor Statistics (Washington, Govt. Print. Off., 1921)
At head of title: U.S. Department of Labor. James J. Davis, secretary. Bureau of Labor Statistics. Ethelbert Stewart, commissioner.
Issued also as House doc. 1030, U.S., 66th Cong., 3d sess.
"Appendix.--Definitions of occupations": p. 111-114.
Keywords: Hours of labor; Wages -- United States; Coal miners -- United States; Coal mines and mining -- United States