Board of Governors of the Federal Reserve System (U.S.), 1935-. "Footnotes," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 20, 1991," H.15 Selected Interest Rates (1991-05-20) : 2-2. https://fraser.stlouisfed.org/title/86/item/67273/toc/464211 , accessed on May 2, 2024.