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-. "January 17, 1990," G.12.3 Industrial Production (1990-01-17) : 6-6. https://fraser.stlouisfed.org/title/55/item/59756/toc/450959 , accessed on May 12, 2024.