Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Seasonally Adjusted and Unadjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "January 17, 1972," G.12.3 Industrial Production (1972-01-17) : 2-2. https://fraser.stlouisfed.org/title/55/item/59791/toc/450945 , accessed on May 3, 2024.