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-. "February 13, 1975," G.12.3 Industrial Production (1975-02-13) : 9-9. https://fraser.stlouisfed.org/title/55/item/59800/toc/469937 , accessed on April 24, 2024.