Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industrial Production, by Industries," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "January 1931," Federal Reserve Bulletin (January 1931) : 20-20. https://fraser.stlouisfed.org/title/62/item/20709/toc/251070 , accessed on May 3, 2024.