Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Mortgage Debt Outstanding on Nonfarm 1 to 4 Family Properties," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1961," Federal Reserve Bulletin (May 1961) : 71-71. https://fraser.stlouisfed.org/title/62/item/21317/toc/52910 , accessed on January 18, 2021.