Board of Governors of the Federal Reserve System (U.S.), 1935-. "Federal Debt Subject to Statutory Limitation," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1980-1989," Annual Statistical Digest (March 1991) : 188-189. https://fraser.stlouisfed.org/title/7/item/23495/toc/414288 , accessed on April 19, 2024.