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. "April 1949," Federal Reserve Bulletin (April 1949) : 93-93. https://fraser.stlouisfed.org/title/62/item/21172/toc/39902 , accessed on May 9, 2024.