United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, July 1, 1950 : Bulletin of the United States Bureau of Labor Statistics, No. 1012,"
Union Wages and Hours : Local Truckdrivers and Helpers
(1951).
https://fraser.stlouisfed.org/title/3960/item/494921, accessed on June 25, 2025.