Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry Groupings, Without Seasonal Adjustment," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "November 1961," Federal Reserve Bulletin (November 1961) : 72-72. https://fraser.stlouisfed.org/title/62/item/21323/toc/151980 , accessed on March 28, 2024.