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. "September 1960," Federal Reserve Bulletin (September 1960) : 82-82. https://fraser.stlouisfed.org/title/62/item/21309/toc/113252 , accessed on March 29, 2024.