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Photo by: Lefteris Pitarakis

Sotheby's auction house worker Mary Engleheart, goes through a rare copy of a book of illustrations by John James Audubon's "Birds of America," in central London, Thursday Sept. 9, 2010. The collection of 435 hand-colored prints, made from engravings of Audubon's illustrations, measures more than 3 feet by 2 feet (90 centimeters by 60 centimeters) because Audubon wanted to paint the birds life size. According to the house, the book of four volumes could reach 6 million pounds ($9.25 million) when it is auctioned in the Magnificent Books, Manuscripts and Drawings from the Collection of Frederick, 2nd Lord Hesketh sale which will take place at Sotheby's in London on Dec. 7, 2010. (AP Photo/Lefteris Pitarakis)

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