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 13, 1991," H.15 Selected Interest Rates (1991-05-13) : 2-2. https://fraser.stlouisfed.org/title/86/item/67264/toc/464208 , accessed on May 4, 2024.