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-. "1987," Annual Statistical Digest (October 1988) : 97-97. https://fraser.stlouisfed.org/title/7/item/23493/toc/193454 , accessed on March 28, 2024.