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 16, 1971," G.12.3 Industrial Production (1971-08-16) : 3-3. https://fraser.stlouisfed.org/title/55/item/59793/toc/468225 , accessed on May 2, 2024.