Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Index of Production of Minerals, by Products," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "August 1929," Federal Reserve Bulletin (August 1929) : 23-23. https://fraser.stlouisfed.org/title/62/item/20692/toc/275353 , accessed on April 24, 2024.