Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Market Groupings, Not Seasonally Adjusted," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "July 1966," Federal Reserve Bulletin (July 1966) : 102-102. https://fraser.stlouisfed.org/title/62/item/21379/toc/228489 , accessed on March 29, 2024.