Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Mineral Products," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "September 1923," Federal Reserve Bulletin (September 1923) : 69-69. https://fraser.stlouisfed.org/title/62/item/20552/toc/72029 , accessed on May 11, 2024.