Board of Governors of the Federal Reserve System (U.S.), 1935-. "Summary of U.S. International Transactions," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1970-1979," Annual Statistical Digest (March 1981) : 346-351. https://fraser.stlouisfed.org/title/7/item/23506/toc/190732 , accessed on April 25, 2024.