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-. "February 16, 1973," G.12.3 Industrial Production (1973-02-16) : 9-9. https://fraser.stlouisfed.org/title/55/item/59547/toc/471387 , accessed on April 23, 2024.