Wages and Hours of Labor in Metalliferous Mines, 1924 and 1931 : Bulletin of the United States Bureau of Labor Statistics, No. 573
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At head of title: United States Department of Labor. W.N. Doak, secretary. Bureau of Labor Statistics. Charles E. Baldwin, acting commissioner.
Issued also as House document 391, 72nd Congress, 2nd session.
"Appendix: Mine terms of occupations, with definitions, and classification."--Page 54-64.
- lcc: HD8051 .A5 no.573
- ddc: 331.06 U57b, no.573
- sudocs: L 2.3:573
- oclc: 20156294