United States. Bureau of Labor Statistics. "Union Wages and Hours: Local Truckdrivers and Helpers, July 1, 1972 : Bulletin of the United States Bureau of Labor Statistics, No. 1802," Union Wages and Hours : Local Truckdrivers and Helpers (1973). https://fraser.stlouisfed.org/title/3960/item/499046, accessed on November 23, 2024.