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. "March 1952," Federal Reserve Bulletin (March 1952) : 75-75. https://fraser.stlouisfed.org/title/62/item/21207/toc/206319 , accessed on April 27, 2024.