Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Factory Employment and Payrolls, by Industries (Without Seasonal Adjustment)," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "March 1940," Federal Reserve Bulletin (March 1940) : 60-61. https://fraser.stlouisfed.org/title/62/item/21023/toc/383795 , accessed on April 26, 2024.