Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Factory Employment: Indexes by Groups," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "November 1930," Federal Reserve Bulletin (November 1930) : 35-35. https://fraser.stlouisfed.org/title/62/item/20707/toc/358927 , accessed on April 23, 2024.