Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Federal Reserve Board Indexes of Production, Employment, and Trade," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "January 1928," Federal Reserve Bulletin (January 1928) : 16-16. https://fraser.stlouisfed.org/title/62/item/20673/toc/138056 , accessed on April 26, 2024.