United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, July 1, 1961 : Bulletin of the United States Bureau of Labor Statistics, No. 1314," Union Wages and Hours : Local Truckdrivers and Helpers (1962). https://fraser.stlouisfed.org/title/3960/item/497668, accessed on December 11, 2024.