United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, My 1, 1959 : Bulletin of the United States Bureau of Labor Statistics, No. 1270," Union Wages and Hours : Local Truckdrivers and Helpers (March 1960). https://fraser.stlouisfed.org/title/3960/item/495851, accessed on November 17, 2024.