Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 13, 1970," G.12.3 Industrial Production (1970-02-13) : 5-5. https://fraser.stlouisfed.org/title/55/item/59561/toc/465850 , accessed on March 28, 2024.