Board of Governors of the Federal Reserve System (U.S.), 1935-. "Market Groupings, Seasonally Adjusted and Unadjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 16, 1972," G.12.3 Industrial Production (1972-05-16) : 2-2. https://fraser.stlouisfed.org/title/55/item/59593/toc/469922 , accessed on March 29, 2024.