Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industrial Production: Industry Groups," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "August 15, 1990," G.17 Industrial Production and Capacity Utilization (August 15, 1990) : 6-7. https://fraser.stlouisfed.org/title/77/item/63577/toc/454701 , accessed on April 18, 2024.