Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Freight-Car Loadings, by Classes," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "July 1939," Federal Reserve Bulletin (July 1939) : 55-55. https://fraser.stlouisfed.org/title/62/item/21015/toc/7434 , accessed on April 19, 2024.