Board of Governors of the Federal Reserve System (U.S.), 1935-. "March 20, 1957," G.27 Commercial and Industrial Loans to U.S. Addresses, Excluding Bankers' Acceptances and Commercial Paper, by Industry (March 20, 1957). https://fraser.stlouisfed.org/scribd/?item_id=481537&filepath=/files/docs/releases/g27/h12_19570320.pdf&start_page=1, accessed on September 24, 2017.
Board of Governors of the Federal Reserve System