Board of Governors of the Federal Reserve System (U.S.), 1935-. "Measures and Components on the Money Stock and Debt," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1990," Annual Statistical Digest (November 1991) : 28-28. https://fraser.stlouisfed.org/title/7/item/23496/toc/252082 , accessed on May 9, 2024.