09/09/2010 03:50 pm ET Updated May 25, 2011

World's Most Expensive Book Comes Up For Sale

One of the highlights is a copy of Birds of America valued at £4m to £6m. The book is bound on a huge scale -- a "double elephant" folio -- because Haiti-born Audubon wanted to paint the birds life size. He would travel across America, shooting the birds before carefully hanging them on bits of wire to paint them.

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