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-. "April 16, 1997," G.17 Industrial Production and Capacity Utilization (1997-04-16) : 6-7. https://fraser.stlouisfed.org/title/77/item/63665/toc/455863 , accessed on April 25, 2024.