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. "February 1948," Federal Reserve Bulletin (February 1948) : 94-94. https://fraser.stlouisfed.org/title/62/item/21158/toc/7817 , accessed on March 29, 2024.