Investigation of wages and working conditions in the coal-mining industry :
hearings ... Sixty-seventh Congress, second session on H.R. 11022 ... March 30, 31, April 1, 3, 4, 1922.
|Corporate Author:||United States.|
Washington, Govt. print. off., 1922.
Coal mines and mining
Coal mines and mining /
Wages > Wages / United States.
Coal miners > Coal miners / United States.
2 v. in 1. (561 p.)
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