United States. Bureau of the Budget and United States. Office of Management and Budget. "Analysis of Federal Activities by Function," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1963," Budget of the United States Government (January 18, 1962) : 55-101. https://fraser.stlouisfed.org/title/54/item/19016/toc/127989 , accessed on April 14, 2024.