Board of Governors of the Federal Reserve System (U.S.), 1935-. "Federal debt subject to statutory limit-Types and ownership," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1980," Annual Statistical Digest (November 1981) : 98-98. https://fraser.stlouisfed.org/title/7/item/23507/toc/300799 , accessed on May 9, 2024.