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. "June 1966," Federal Reserve Bulletin (June 1966) : 112-112. https://fraser.stlouisfed.org/title/62/item/21378/toc/400598 , accessed on March 19, 2024.