Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Group Index Numbers - Canadian Department of Labor," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "April 1920," Federal Reserve Bulletin (April 1920) : 58-58. https://fraser.stlouisfed.org/title/62/item/20600/toc/75704 , accessed on May 5, 2024.