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-. "September 16, 1964," G.12.3 Industrial Production (1964-09-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59550/toc/486750 , accessed on April 17, 2024.