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-. "September 16, 1966," G.12.3 Industrial Production (1966-09-16) : 5-5. https://fraser.stlouisfed.org/title/55/item/59581/toc/487758 , accessed on May 4, 2024.