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-. "September 14, 1990," G.17 Industrial Production and Capacity Utilization (1990-09-14) : 4-5. https://fraser.stlouisfed.org/title/77/item/63582/toc/454716 , accessed on April 17, 2024.