Board of Governors of the Federal Reserve System (U.S.), 1935-. "Total Net Issues, Unadjusted Net Flows," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "August 24, 1981 : Annual Revisions," Z.1 Financial Accounts of the United States (1981-08-24) : 40-40. https://fraser.stlouisfed.org/title/93/item/69066/toc/480917 , accessed on April 18, 2024.