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-. "1973-1977," Annual Statistical Digest (December 1978) : 153-155. https://fraser.stlouisfed.org/title/7/item/23504/toc/110136 , accessed on April 21, 2024.