Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Mortgage Debt Outstanding," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "December 1979," Federal Reserve Bulletin (December 1979) : 121-121. https://fraser.stlouisfed.org/title/62/item/20460/toc/129780 , accessed on April 23, 2024.