Hours and earnings in anthracite and bituminous coal mining : anthracite-1919 and 1920, bituminous-1919
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書誌事項
Hours and earnings in anthracite and bituminous coal mining : anthracite-1919 and 1920, bituminous-1919
(Bulletin / Bureau of Labor Statistics, no. 279)(Wages and hours of labor series)
U.S. G.P.O., 1921
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注記
At head of title: United States Department of Labor... Bureau of Labor Statistics...