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-. "1973-1977," Annual Statistical Digest (December 1978) : 177-179. https://fraser.stlouisfed.org/title/7/item/23504/toc/110145 , accessed on June 24, 2024.