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-. "November 14, 1989," G.12.3 Industrial Production (1989-11-14) : 6-6. https://fraser.stlouisfed.org/title/55/item/59754/toc/474644 , accessed on March 29, 2024.