Board of Governors of the Federal Reserve System (U.S.), 1935-. "Aggregate Reserves of Depository Institutions and Monetary Base," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1988," Annual Statistical Digest (November 1989) : 35-36. https://fraser.stlouisfed.org/title/7/item/23494/toc/426450 , accessed on April 24, 2024.