United States. Bureau of Labor Statistics. "Wage Chronology: Bituminous Coal Mines, 1933-66 : Bulletin of the United States Bureau of Labor Statistics, No. 1461," Wage Chronology: Bituminous Coal Mine Operators and United Mine Workers of America (1965). https://fraser.stlouisfed.org/title/4650/item/498056, accessed on April 11, 2025.
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