Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Employment in Nonagricultural Establishments, by Industry Division," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1961," Federal Reserve Bulletin (May 1961) : 84-84. https://fraser.stlouisfed.org/title/62/item/21317/toc/52863 , accessed on April 18, 2024.