Board of Governors of the Federal Reserve System (U.S.), 1935-. "Availability of Data for Preliminary Estimates," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "December 5, 1990," Z.1 Financial Accounts of the United States (1990-12-05) : 6-7. https://fraser.stlouisfed.org/title/93/item/69142/toc/477045 , accessed on April 19, 2024.