Board of Governors of the Federal Reserve System (U.S.), 1935-. "Debt of federal and federally sponsored credit agencies," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1972-1976," Annual Statistical Digest (December 1977) : 169-171. https://fraser.stlouisfed.org/title/7/item/23503/toc/117656 , accessed on April 25, 2024.