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-. "December 15, 1997," G.17 Industrial Production and Capacity Utilization (1997-12-15) : 6-7. https://fraser.stlouisfed.org/title/77/item/63674/toc/455969 , accessed on April 19, 2024.