United States. Bureau of the Budget and United States. Office of Management and Budget. "Means of Financing and Outstanding Debt," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year 1969," Budget of the United States Government (January 29, 1968) : 61-61. https://fraser.stlouisfed.org/title/54/item/19022/toc/380805 , accessed on May 11, 2024.