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. "December 1957," Federal Reserve Bulletin (December 1957) : 48-49. https://fraser.stlouisfed.org/title/62/item/21276/toc/50785 , accessed on April 26, 2024.