Board of Governors of the Federal Reserve System (U.S.), 1935-. "Checkable Deposits and Currency, Seasonally Adjusted Annual Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "September 19, 1989 : Annual Revisions," Z.1 Financial Accounts of the United States (1989-09-19) : 50-50. https://fraser.stlouisfed.org/title/93/item/69056/toc/475976 , accessed on May 9, 2024.