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-. "September 15, 1978," G.12.3 Industrial Production (1978-09-15) : 6-6. https://fraser.stlouisfed.org/title/55/item/59614/toc/470459 , accessed on April 25, 2024.