Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Gross Public Debt, by Type of Security," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1975," Federal Reserve Bulletin (June 1975) : 89-89. https://fraser.stlouisfed.org/title/62/item/21486/toc/198309 , accessed on April 30, 2024.