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 16, 1976," G.12.3 Industrial Production (1976-06-16) : 8-8. https://fraser.stlouisfed.org/title/55/item/59528/toc/470073 , accessed on April 18, 2024.