United States. Bureau of Labor Statistics. "Union Wages and Hours: Motortruck Drivers and Helpers, July 1, 1958 : Bulletin of the United States Bureau of Labor Statistics, No. 1246," Union Wages and Hours : Local Truckdrivers and Helpers (March 1959). https://fraser.stlouisfed.org/title/3960/item/495779, accessed on March 28, 2025.