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-. "June 12, 1970," G.12.3 Industrial Production (1970-06-12) : 3-3. https://fraser.stlouisfed.org/title/55/item/59565/toc/467979 , accessed on April 25, 2024.