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. "March 1967," Federal Reserve Bulletin (March 1967) : 104-104. https://fraser.stlouisfed.org/title/62/item/21387/toc/347073 , accessed on June 23, 2024.