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-. "November 15, 1972," G.12.3 Industrial Production (1972-11-15) : 2-2. https://fraser.stlouisfed.org/title/55/item/59708/toc/471380 , accessed on May 1, 2024.