United States. Bureau of the Budget and United States. Office of Management and Budget. "Summary of International Transactions of the Federal Government," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year Ending June 30, 1966," Budget of the United States Government (January 25, 1965) : 477-477. https://fraser.stlouisfed.org/title/54/item/19019/toc/108442 , accessed on March 19, 2024.