Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "March 16, 1973," G.12.3 Industrial Production (1973-03-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59545/toc/471394 , accessed on May 1, 2024.