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. "March 1975," Federal Reserve Bulletin (March 1975) : 121-121. https://fraser.stlouisfed.org/title/62/item/21483/toc/192518 , accessed on May 9, 2024.