Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Total Debt, by Type of Security," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1968," Federal Reserve Bulletin (April 1968) : 95-95. https://fraser.stlouisfed.org/title/62/item/21400/toc/419326 , accessed on April 17, 2024.