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. "March 1993," Federal Reserve Bulletin (March 1993) : 130-130. https://fraser.stlouisfed.org/title/62/item/20850/toc/127680 , accessed on June 16, 2024.