United States. Bureau of the Budget and United States. Office of Management and Budget. "Administrative Budget Totals and Public Debt," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1968," Budget of the United States Government (January 24, 1967) : 448-448. https://fraser.stlouisfed.org/title/54/item/19021/toc/408902 , accessed on May 4, 2024.