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. "January 1990," Federal Reserve Bulletin (January 1990) : 90-91. https://fraser.stlouisfed.org/title/62/item/20812/toc/357523 , accessed on April 19, 2024.