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-. "August 17, 1977 : Revision 1967-76," Z.1 Financial Accounts of the United States (1977-08-17) : 35-35. https://fraser.stlouisfed.org/title/93/item/69134/toc/477985 , accessed on April 19, 2024.