Board of Governors of the Federal Reserve System (U.S.), 1935-. "May 31, 1961," G.27 Commercial and Industrial Loans to U.S. Addresses, Excluding Bankers' Acceptances and Commercial Paper, by Industry (May 31, 1961). https://fraser.stlouisfed.org/scribd/?item_id=481756&filepath=/files/docs/releases/g27/h12_19610531.pdf&start_page=1, accessed on September 23, 2017.
Board of Governors of the Federal Reserve System