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LONDON - A rare copy of John James Audubon's "Birds of America," billed as the world's most expensive book, is up for sale alongside a first edition of Shakespeare's plays at an auction to set book lovers' pulses racing, Sotheby's said Thursday.
One of only 100 or so remaining copies of "Birds of America" is valued at between $6.2 million and $9.2 million, while a Shakespeare First Folio from 1623 is expected to fetch at least $1.54 million.
