Board of Governors of the Federal Reserve System (U.S.), 1935-. "Treasury Currency and SDR Certificates, Unadjusted Net Flows," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 11, 1980," Z.1 Financial Accounts of the United States (1980-02-11) : 35-35. https://fraser.stlouisfed.org/title/93/item/69088/toc/480119 , accessed on May 13, 2024.