United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, July 1, 1949 : Bulletin of the United States Bureau of Labor Statistics, No. 978,"
Union Wages and Hours : Local Truckdrivers and Helpers
(1950).
https://fraser.stlouisfed.org/title/3960/item/494920, accessed on June 13, 2025.