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. "May 1931," Federal Reserve Bulletin (May 1931) : 20-20. https://fraser.stlouisfed.org/title/62/item/20713/toc/35755 , accessed on March 28, 2024.