Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Estimated Foreign Holdings of Marketable U.S. Government Bonds and Notes," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "July 1967," Federal Reserve Bulletin (July 1967) : 177-177. https://fraser.stlouisfed.org/title/62/item/21391/toc/221292 , accessed on May 3, 2024.