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. "January 1972," Federal Reserve Bulletin (January 1972) : 180-180. https://fraser.stlouisfed.org/title/62/item/21445/toc/196139 , accessed on March 19, 2024.