United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, July 1, 1962 : Bulletin of the United States Bureau of Labor Statistics, No. 1356," Union Wages and Hours : Local Truckdrivers and Helpers (1963). https://fraser.stlouisfed.org/title/3960/item/497783, accessed on March 25, 2025.