United States. Bureau of Labor Statistics. Division of Industrial Relations and United States. Bureau of Labor Statistics. "Labor-Management Contract Provisions, 1950-51. Prevalence and Characteristics of Selected Collective Bargaining Clauses : Bulletin of the United States Bureau of Labor Statistics, No. 1091," Labor-Management Contract Provisions (1952). https://fraser.stlouisfed.org/title/4489/item/495069, accessed on October 12, 2024.