Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Industry Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1969," Federal Reserve Bulletin (May 1969) : 118-118. https://fraser.stlouisfed.org/title/62/item/21413/toc/186677 , accessed on April 26, 2024.