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-. "November 17, 1969," G.12.3 Industrial Production (1969-11-17) : 2-2. https://fraser.stlouisfed.org/title/55/item/59557/toc/492503 , accessed on April 25, 2024.