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. "May 1968," Federal Reserve Bulletin (May 1968) : 95-95. https://fraser.stlouisfed.org/title/62/item/21401/toc/241017 , accessed on April 18, 2024.