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. "April 1966," Federal Reserve Bulletin (April 1966) : 141-141. https://fraser.stlouisfed.org/title/62/item/21376/toc/297352 , accessed on March 29, 2024.