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. "April 1964," Federal Reserve Bulletin (April 1964) : 74-74. https://fraser.stlouisfed.org/title/62/item/21352/toc/415075 , accessed on April 19, 2024.