Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "August 16, 1989," G.12.3 Industrial Production (1989-08-16) : 4-4. https://fraser.stlouisfed.org/title/55/item/59751/toc/474599 , accessed on April 18, 2024.