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. "February 1960," Federal Reserve Bulletin (February 1960) : 89-89. https://fraser.stlouisfed.org/title/62/item/21302/toc/112508 , accessed on April 17, 2024.