United States. Bureau of Labor Statistics. "Digest of One Hundred Selected Pension Plans Under Collective Bargaining, Spring 1961 : Bulletin of the United States Bureau of Labor Statistics, No. 1307," Digest of 50 Selected Pension Plans for Salaried Employees (1962). https://fraser.stlouisfed.org/title/4696/item/497661, accessed on November 17, 2024.