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-. "February 16, 1966," G.12.3 Industrial Production (1966-02-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59807/toc/487434 , accessed on May 2, 2024.