Board of Governors of the Federal Reserve System (U.S.), 1935-. "Foreign Exchange Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1987," Annual Statistical Digest (October 1988) : 180-180. https://fraser.stlouisfed.org/title/7/item/23493/toc/193495 , accessed on March 28, 2024.