Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Indexes of Industrial Activity in Foreign Countries, Germany," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1923," Federal Reserve Bulletin (May 1923) : 76-76. https://fraser.stlouisfed.org/title/62/item/20548/toc/370084 , accessed on April 23, 2024.