Board of Governors of the Federal Reserve System (U.S.), 1935-. "Mortgage Debt Outstanding, by Type of Holder and Type of Property," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "1980," Annual Statistical Digest (November 1981) : 116-117. https://fraser.stlouisfed.org/title/7/item/23507/toc/300813 , accessed on April 19, 2024.