Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "National Summary of Business Conditions," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "January 1961," Federal Reserve Bulletin (January 1961) : 39-40. https://fraser.stlouisfed.org/title/62/item/21313/toc/340224 , accessed on April 25, 2024.