Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industrial Production - Indexes and Gross Value," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1996," Federal Reserve Bulletin (September 1996) : 138-139. https://fraser.stlouisfed.org/title/62/item/20892/toc/149454 , accessed on May 12, 2024.