United States. Bureau of the Budget and United States. Office of Management and Budget. "Budget Receipts, Outlays, Financing and Debt," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year 1972," Budget of the United States Government (January 29, 1971) : 563-563. https://fraser.stlouisfed.org/title/54/item/19026/toc/60566 , accessed on April 30, 2024.