Copy of the first edition of Lobachevsky's work sold at Sotheby's, London on June 2, 2006.
Copy of the first edition of Lobachevsky's work sold at Sotheby's, London on June 2, 2006. It was offered with an estimate of 200,000-250,000 GBP, but did not sell. A different copy sold at Christie's in New York for $134,500 on June 22, 2010.
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