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. "December 1968," Federal Reserve Bulletin (December 1968) : 148-148. https://fraser.stlouisfed.org/title/62/item/21408/toc/323896 , accessed on April 19, 2024.