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-. "June 15, 1979," G.12.3 Industrial Production (1979-06-15) : 13-13. https://fraser.stlouisfed.org/title/55/item/59620/toc/470619 , accessed on April 30, 2024.