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. "December 1949," Federal Reserve Bulletin (December 1949) : 67-67. https://fraser.stlouisfed.org/title/62/item/21180/toc/259742 , accessed on April 23, 2024.