Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Pig Iron Production and Exports, United States, England, France, and Germany," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1921," Federal Reserve Bulletin (September 1921) : 47-47. https://fraser.stlouisfed.org/title/62/item/20527/toc/392885 , accessed on April 19, 2024.