Board of Governors of the Federal Reserve System (U.S.), 1935-. "Industry Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "March 16, 1978," G.12.3 Industrial Production (1978-03-16) : 5-5. https://fraser.stlouisfed.org/title/55/item/59609/toc/470349 , accessed on April 30, 2024.