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-. "March 16, 1966," G.12.3 Industrial Production (1966-03-16) : 2-2. https://fraser.stlouisfed.org/title/55/item/59578/toc/487482 , accessed on May 3, 2024.