Wage rates and working time in the bituminous coal industry, 1912-1922 : with a summary of rates for separate occupations in each coal district in the United States
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Wage rates and working time in the bituminous coal industry, 1912-1922 : with a summary of rates for separate occupations in each coal district in the United States
（Research studies / Industrial Research Department, Wharton School of Finance and Commerce, University of Pennsylvania, 21）
University of Pennsylvania Press, 1932
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