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-. "June 16, 1966," G.12.3 Industrial Production (1966-06-16) : 4-4. https://fraser.stlouisfed.org/title/55/item/59806/toc/487623 , accessed on April 28, 2024.