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 16, 1970," G.12.3 Industrial Production (1970-03-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59562/toc/467782 , accessed on May 4, 2024.