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 17, 1989," G.12.3 Industrial Production (1989-10-17) : 6-6. https://fraser.stlouisfed.org/title/55/item/59753/toc/474628 , accessed on April 30, 2024.