Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Bond and Stock Yields," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1971," Federal Reserve Bulletin (April 1971) : 133-133. https://fraser.stlouisfed.org/title/62/item/21436/toc/98887 , accessed on May 9, 2024.