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. "June 1961," Federal Reserve Bulletin (June 1961) : 63-63. https://fraser.stlouisfed.org/title/62/item/21318/toc/210962 , accessed on April 23, 2024.