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-. "December 16, 1964," G.12.3 Industrial Production (1964-12-16) : 4-4. https://fraser.stlouisfed.org/title/55/item/59553/toc/486864 , accessed on March 28, 2024.