Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "October 16, 1987," G.12.3 Industrial Production (1987-10-16) : 6-6. https://fraser.stlouisfed.org/title/55/item/59724/toc/473888 , accessed on June 27, 2024.