United States. Bureau of the Budget and United States. Office of Management and Budget. "Federal Finances and the Gross National Product," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year 1971," Budget of the United States Government (February 2, 1970) : 587-587. https://fraser.stlouisfed.org/title/54/item/19025/toc/62084 , accessed on April 17, 2024.