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. "September 1967," Federal Reserve Bulletin (September 1967) : 190-190. https://fraser.stlouisfed.org/title/62/item/21393/toc/350601 , accessed on April 24, 2024.