United States. Bureau of Labor Statistics. "Union Wages and Hours: Local Truckdrivers and Helpers, July 1, 1973 : Bulletin of the United States Bureau of Labor Statistics, No. 1840," Union Wages and Hours : Local Truckdrivers and Helpers (1975). https://fraser.stlouisfed.org/title/3960/item/499069, accessed on November 21, 2024.