Board of Governors of the Federal Reserve System (U.S.), 1935-. "Treasury Currency and SDR Certificates, Seasonally Adjusted Annual Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 19, 1981," Z.1 Financial Accounts of the United States (1981-05-19) : 36-36. https://fraser.stlouisfed.org/title/93/item/69129/toc/480755 , accessed on March 29, 2024.