United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, July 1, 1952 : Bulletin of the United States Bureau of Labor Statistics, No. 1125," Union Wages and Hours : Local Truckdrivers and Helpers (1953). https://fraser.stlouisfed.org/title/3960/item/494923, accessed on March 26, 2025.