Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industrial Production, by Industries (Unadjusted Indexes)," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "August 1939," Federal Reserve Bulletin (August 1939) : 49-49. https://fraser.stlouisfed.org/title/62/item/21016/toc/394014 , accessed on May 11, 2024.