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 1941," Federal Reserve Bulletin (February 1941) : 78-78. https://fraser.stlouisfed.org/title/62/item/21034/toc/133090 , accessed on June 24, 2024.