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. "July 1961," Federal Reserve Bulletin (July 1961) : 83-83. https://fraser.stlouisfed.org/title/62/item/21319/toc/161366 , accessed on April 25, 2024.