Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 16, 1980," G.12.3 Industrial Production (1980-05-16) : 4-4. https://fraser.stlouisfed.org/title/55/item/59631/toc/471970 , accessed on May 9, 2024.