Board of Governors of the Federal Reserve System (U.S.), 1935-. "Debt Outstanding By Sector," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "June 12, 1991," Z.1 Financial Accounts of the United States (1991-06-12) : 11-11. https://fraser.stlouisfed.org/title/93/item/69043/toc/468298 , accessed on March 28, 2024.