Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry and Summary Market Groupings, Without Seasonal Adjustment," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1961," Federal Reserve Bulletin (September 1961) : 63-63. https://fraser.stlouisfed.org/title/62/item/21321/toc/193817 , accessed on April 24, 2024.