Board of Governors of the Federal Reserve System (U.S.), 1935-. "Index of weighted-average value of U.S. dollar," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1981," Annual Statistical Digest (October 1982) : 166-166. https://fraser.stlouisfed.org/title/7/item/23508/toc/396212 , accessed on April 19, 2024.