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 14, 1964," G.12.3 Industrial Production (1964-02-14) : 3-3. https://fraser.stlouisfed.org/title/55/item/59810/toc/480752 , accessed on April 23, 2024.