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-. "1970-1979," Annual Statistical Digest (March 1981) : 224-228. https://fraser.stlouisfed.org/title/7/item/23506/toc/190712 , accessed on May 7, 2024.