Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Foreign Exchange Rates," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1957," Federal Reserve Bulletin (April 1957) : 127-127. https://fraser.stlouisfed.org/title/62/item/21268/toc/98205 , accessed on April 26, 2024.