United States. Bureau of Labor Statistics. "Union Wages and Hours: Local Truckdrivers and Helpers, July 1, 1977 : Bulletin of the United States Bureau of Labor Statistics, No. 2015," Union Wages and Hours : Local Truckdrivers and Helpers (1979). https://fraser.stlouisfed.org/title/3960/item/499446, accessed on December 3, 2024.