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. "January 1966," Federal Reserve Bulletin (January 1966) : 99-99. https://fraser.stlouisfed.org/title/62/item/21373/toc/372678 , accessed on April 23, 2024.