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 16, 1975," G.12.3 Industrial Production (1975-06-16) : 10-10. https://fraser.stlouisfed.org/title/55/item/59597/toc/469986 , accessed on May 13, 2024.