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. "September 1978," Federal Reserve Bulletin (September 1978) : 131-131. https://fraser.stlouisfed.org/title/62/item/20445/toc/376934 , accessed on March 28, 2024.