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-. "February 15, 1980," G.12.3 Industrial Production (1980-02-15) : 5-5. https://fraser.stlouisfed.org/title/55/item/59629/toc/471918 , accessed on April 25, 2024.