United States. Bureau of Labor Statistics , Nelson, Richard Rex , Symkowiak, Ronald J. and Mann, Jacquelyn E. Collective Bargaining Agreements for State and County Government Employees : Bulletin of the United States Bureau of Labor Statistics, No. 1920 , Washington, D.C: U.S. Dept. of Labor, Bureau of Labor Statistics, 1976, https://fraser.stlouisfed.org/title/4672, accessed on September 17, 2024.