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-. "September 16, 1976," G.12.3 Industrial Production (1976-09-16) : 5-5. https://fraser.stlouisfed.org/title/55/item/59523/toc/470107 , accessed on May 14, 2024.