Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Seasonally Adjusted and Unadjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "August 15, 1972," G.12.3 Industrial Production (1972-08-15) : 3-3. https://fraser.stlouisfed.org/title/55/item/59730/toc/471357 , accessed on May 3, 2024.