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. "March 1971," Federal Reserve Bulletin (March 1971) : 146-146. https://fraser.stlouisfed.org/title/62/item/21435/toc/47514 , accessed on April 18, 2024.