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-. "May 16, 1972," G.12.3 Industrial Production (1972-05-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59593/toc/469924 , accessed on April 23, 2024.