Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industrial Production: Industry Subtotals and Individual Series," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "March 15, 1991," G.17 Industrial Production and Capacity Utilization (1991-03-15) : 12-15. https://fraser.stlouisfed.org/title/77/item/63588/toc/454783 , accessed on April 23, 2024.