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. "September 1989," Federal Reserve Bulletin (September 1989) : 108-108. https://fraser.stlouisfed.org/title/62/item/20808/toc/425320 , accessed on May 5, 2024.