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-. "March 15, 1974," G.12.3 Industrial Production (1974-03-15) : 5-5. https://fraser.stlouisfed.org/title/55/item/59525/toc/471495 , accessed on April 17, 2024.