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If anyone is interested in GCR history, and has a spare $3000 - 4000, from Christies auction catalogue http://www.christies.com/LotFinder/search/LOTDETAIL.ASP?sid=&intObjectID=4443578 of their sale on 23rd Feb 2005 in New York. "GREAT CENTRAL RAILWAY. Series of 10 typed letters and memoranda on calculating machines showing how calculating machines were ordered and sold. August 10-November 1, 1915. 11 pages total."