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. "February 1961," Federal Reserve Bulletin (February 1961) : 85-85. https://fraser.stlouisfed.org/title/62/item/21314/toc/151735 , accessed on May 4, 2024.