United States. Department of the Treasury. "Tables - International Financial Transactions," in United States. Department of the Treasury. "Annual Report of the Secretary of the Treasury on the State of the Finances, Fiscal Year 1977 : Statistical Appendix," Annual Report of the Secretary of the Treasury on the State of the Finances (Fiscal Year Ended September 30, 1977) : 369-379. https://fraser.stlouisfed.org/title/194/item/5621/toc/77888 , accessed on May 8, 2024.