Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Value of Exports and Imports of Selected Commodities," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "March 1921," Federal Reserve Bulletin (March 1921) : 58-58. https://fraser.stlouisfed.org/title/62/item/20521/toc/249239 , accessed on April 17, 2024.