Board of Governors of the Federal Reserve System (U.S.), 1935-. "Preface," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1972-1976," Annual Statistical Digest (December 1977) : 3-3. https://fraser.stlouisfed.org/title/7/item/23503/toc/117622 , accessed on May 9, 2024.