Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry and Summary Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "December 1961," Federal Reserve Bulletin (December 1961) : 79-79. https://fraser.stlouisfed.org/title/62/item/21324/toc/265335 , accessed on April 18, 2024.