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 15, 1976," G.12.3 Industrial Production (1976-11-15) : 4-4. https://fraser.stlouisfed.org/title/55/item/59600/toc/470136 , accessed on April 28, 2024.