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. "August 1999," Federal Reserve Bulletin (August 1999) : 117-118. https://fraser.stlouisfed.org/title/62/item/20927/toc/96121 , accessed on May 4, 2024.