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 1961," Federal Reserve Bulletin (January 1961) : 84-84. https://fraser.stlouisfed.org/title/62/item/21313/toc/340278 , accessed on July 9, 2024.