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," Annual Statistical Digest (November 1981) : 222-240. https://fraser.stlouisfed.org/title/7/item/23507/toc/300857 , accessed on June 26, 2024.