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, 1973," G.12.3 Industrial Production (1973-06-15) : 9-9. https://fraser.stlouisfed.org/title/55/item/59769/toc/471424 , accessed on May 10, 2024.