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 1971," Federal Reserve Bulletin (June 1971) : 168-168. https://fraser.stlouisfed.org/title/62/item/21438/toc/369554 , accessed on April 19, 2024.