Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "June 15, 1977," G.12.3 Industrial Production (1977-06-15) : 10-10. https://fraser.stlouisfed.org/title/55/item/59796/toc/470210 , accessed on May 1, 2024.