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-. "January 17, 1978," G.12.3 Industrial Production (1978-01-17) : 13-13. https://fraser.stlouisfed.org/title/55/item/59607/toc/470319 , accessed on April 19, 2024.