Board of Governors of the Federal Reserve System (U.S.), 1935-. "Notes to Tables," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1980-1989," Annual Statistical Digest (March 1991) : 687-700. https://fraser.stlouisfed.org/title/7/item/23495/toc/414344 , accessed on May 10, 2024.