Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Indexes of Industrial Activity," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1922," Federal Reserve Bulletin (June 1922) : 84-85. https://fraser.stlouisfed.org/title/62/item/20536/toc/89454 , accessed on April 18, 2024.