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. "July 1951," Federal Reserve Bulletin (July 1951) : 124-124. https://fraser.stlouisfed.org/title/62/item/21199/toc/110338 , accessed on March 28, 2024.