Board of Governors of the Federal Reserve System (U.S.), 1935-. "Preface," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1970-1979," Annual Statistical Digest (March 1981) : 3-3. https://fraser.stlouisfed.org/title/7/item/23506/toc/190682 , accessed on May 10, 2024.