Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Convertible Foreign Currency Held by Federal Reserve Banks," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "August 1968," Federal Reserve Bulletin (August 1968) : 62-62. https://fraser.stlouisfed.org/title/62/item/21404/toc/368110 , accessed on March 29, 2024.