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-. "1980," Annual Statistical Digest (November 1981) : 168-168. https://fraser.stlouisfed.org/title/7/item/23507/toc/300838 , accessed on July 12, 2024.