United States. Bureau of Labor Statistics. "Wages and Hours of Labor in the Slaughtering and Meat-Packing Industry, 1929 : Bulletin of the United States Bureau of Labor Statistics, No. 535," Wages and Hours of Labor in the Slaughtering and Meat-Packing Industry (1931). https://fraser.stlouisfed.org/title/3926/item/493183, accessed on March 25, 2025.