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. "May 1948," Federal Reserve Bulletin (May 1948) : 76-76. https://fraser.stlouisfed.org/title/62/item/21161/toc/316670 , accessed on June 15, 2024.