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-. "August 15, 1978," G.12.3 Industrial Production (1978-08-15) : 13-13. https://fraser.stlouisfed.org/title/55/item/59613/toc/470447 , accessed on April 25, 2024.