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. "August 1926," Federal Reserve Bulletin (August 1926) : 26-26. https://fraser.stlouisfed.org/title/62/item/20656/toc/143523 , accessed on April 18, 2024.