United States. Bureau of Labor Statistics. Projections, 1970: Interindustry Relationships, Potential Demand, Employment : Bulletin of the United States Bureau of Labor Statistics, No. 1536 , Washington, D.C: U.S. Dept. of Labor Bureau of Labor Statistics, 1966, https://fraser.stlouisfed.org/title/4938, accessed on September 12, 2024.