Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Market Groupings, Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "October 1967," Federal Reserve Bulletin (October 1967) : 126-126. https://fraser.stlouisfed.org/title/62/item/21394/toc/152596 , accessed on May 3, 2024.