Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industrial Production: Market Groups," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "December 14, 1990," G.17 Industrial Production and Capacity Utilization (1990-12-14) : 4-5. https://fraser.stlouisfed.org/title/77/item/63585/toc/454751 , accessed on April 23, 2024.