Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Merchandise Exports and Imports," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1968," Federal Reserve Bulletin (September 1968) : 140-140. https://fraser.stlouisfed.org/title/62/item/21405/toc/65222 , accessed on May 14, 2024.