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-. "August 13, 1970," G.12.3 Industrial Production (1970-08-13) : 3-3. https://fraser.stlouisfed.org/title/55/item/59768/toc/468025 , accessed on April 25, 2024.