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. "April 1990," Federal Reserve Bulletin (April 1990) : 118-118. https://fraser.stlouisfed.org/title/62/item/20815/toc/392093 , accessed on May 3, 2024.