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. "April 1966," Federal Reserve Bulletin (April 1966) : 122-122. https://fraser.stlouisfed.org/title/62/item/21376/toc/297319 , accessed on March 29, 2024.