Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "August 1961," Federal Reserve Bulletin (August 1961) : 82-82. https://fraser.stlouisfed.org/title/62/item/21320/toc/82546 , accessed on April 25, 2024.