Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 16, 1990," G.12.3 Industrial Production (1990-02-16) : 7-7. https://fraser.stlouisfed.org/title/55/item/59757/toc/450973 , accessed on March 29, 2024.