Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Nonfinancial Business Activity - Selected Measures," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1992," Federal Reserve Bulletin (May 1992) : 135-135. https://fraser.stlouisfed.org/title/62/item/20841/toc/184769 , accessed on May 3, 2024.