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-. "1987," Annual Statistical Digest (October 1988) : 104-104. https://fraser.stlouisfed.org/title/7/item/23493/toc/193457 , accessed on April 23, 2024.