United States. Bureau of the Budget and United States. Office of Management and Budget. "Civilian Employment in the Executive Branch by Type of Position Occupied," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1966," Budget of the United States Government (January 25, 1965) : 373-373. https://fraser.stlouisfed.org/title/54/item/19019/toc/108386 , accessed on May 6, 2024.