Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry and Summary Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "January 1961," Federal Reserve Bulletin (January 1961) : 82-82. https://fraser.stlouisfed.org/title/62/item/21313/toc/340276 , accessed on May 5, 2024.