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-. "1974-1978," Annual Statistical Digest (January 1980) : 125-125. https://fraser.stlouisfed.org/title/7/item/23505/toc/133561 , accessed on March 28, 2024.