Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "U.S. Government Marketable and Convertible Securities Outstanding," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1966," Federal Reserve Bulletin (May 1966) : 66-66. https://fraser.stlouisfed.org/title/62/item/21377/toc/139181 , accessed on April 18, 2024.