Board of Governors of the Federal Reserve System (U.S.), 1935-. "Gross public debt of the U.S. Treasury-Types and ownership," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1974-1978," Annual Statistical Digest (January 1980) : 126-128. https://fraser.stlouisfed.org/title/7/item/23505/toc/133562 , accessed on March 28, 2024.