Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Index of Production of Minerals, by Productions," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "February 1929," Federal Reserve Bulletin (February 1929) : 30-30. https://fraser.stlouisfed.org/title/62/item/20686/toc/167295 , accessed on April 25, 2024.