Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 1, 1968," G.27 Commercial and Industrial Loans to U.S. Addresses, Excluding Bankers' Acceptances and Commercial Paper, by Industry (May 1, 1968). https://fraser.stlouisfed.org/scribd/?item_id=482118&filepath=/files/docs/releases/g27/h12_19680501.pdf&start_page=1, accessed on August 20, 2017.
Board of Governors of the Federal Reserve System