United States. Bureau of Labor Statistics. "Hours and Earnings in Anthracite and Bituminous Coal Mining, 1922 and 1924 : Bulletin of the United States Bureau of Labor Statistics, No. 416," Wages and Hours of Labor in Bituminous-Coal Mining (September 1926). https://fraser.stlouisfed.org/title/4021/item/493203, accessed on March 20, 2025.
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