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 14, 1978," G.12.3 Industrial Production (1978-07-14) : 13-13. https://fraser.stlouisfed.org/title/55/item/59612/toc/470421 , accessed on April 18, 2024.