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-. "June 12, 1970," G.12.3 Industrial Production (1970-06-12) : 2-2. https://fraser.stlouisfed.org/title/55/item/59565/toc/467975 , accessed on May 2, 2024.