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. "June 1950," Federal Reserve Bulletin (June 1950) : 103-103. https://fraser.stlouisfed.org/title/62/item/21186/toc/257300 , accessed on April 19, 2024.