Board of Governors of the Federal Reserve System (U.S.), 1935-. "Summary Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "July 13, 1979," G.12.3 Industrial Production (1979-07-13) : 13-13. https://fraser.stlouisfed.org/title/55/item/59621/toc/470624 , accessed on April 25, 2024.