Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Physical Volume of Trade," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1922," Federal Reserve Bulletin (May 1922) : 100-106. https://fraser.stlouisfed.org/title/62/item/20537/toc/103937 , accessed on May 13, 2024.