Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "United States Government Debt, by Type of Security," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1960," Federal Reserve Bulletin (May 1960) : 70-70. https://fraser.stlouisfed.org/title/62/item/21305/toc/399925 , accessed on May 4, 2024.