Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Mortgage Debt Outstanding on Residential Properties," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1972," Federal Reserve Bulletin (June 1972) : 138-138. https://fraser.stlouisfed.org/title/62/item/21451/toc/14456 , accessed on May 1, 2024.