United States. Bureau of Labor Statistics. "Hours and Earnings in Anthracite and Bituminous Coal Mining. Anthracite—January, 1922. Bituminous—Winter of 1921-22 : Bulletin of the United States Bureau of Labor Statistics, No. 316," Wages and Hours of Labor in Bituminous-Coal Mining (July 1922). https://fraser.stlouisfed.org/title/4021/item/493034, accessed on February 21, 2025.
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