Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Index of Value of Foreign Trade in Selected Commodities," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "July 1921," Federal Reserve Bulletin (July 1921) : 60-60. https://fraser.stlouisfed.org/title/62/item/20525/toc/306646 , accessed on April 18, 2024.