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-. "August 15, 1966," G.12.3 Industrial Production (1966-08-15) : 2-2. https://fraser.stlouisfed.org/title/55/item/59580/toc/487714 , accessed on April 23, 2024.