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. "December 1964," Federal Reserve Bulletin (December 1964) : 76-76. https://fraser.stlouisfed.org/title/62/item/21360/toc/247620 , accessed on April 18, 2024.