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. "April 1939," Federal Reserve Bulletin (April 1939) : 9-10. https://fraser.stlouisfed.org/title/62/item/21012/toc/186778 , accessed on May 11, 2024.