Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "January 15, 1964," G.12.3 Industrial Production (1964-01-15) : 2-2. https://fraser.stlouisfed.org/title/55/item/59809/toc/479375 , accessed on May 4, 2024.