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. "October 1972," Federal Reserve Bulletin (October 1972) : 138-138. https://fraser.stlouisfed.org/title/62/item/21454/toc/417964 , accessed on May 11, 2024.