Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Group Index Numbers - United States, Bureau of Labor Statistics," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "June 1922," Federal Reserve Bulletin (June 1922) : 77-77. https://fraser.stlouisfed.org/title/62/item/20536/toc/89439 , accessed on June 29, 2024.