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Another milestone in the digital era: Barnes & Noble says it's selling more books for its e-reader, the Nook, than physical copies of books on its website. The company reported selling close to 1 million e-books on Christmas Day alone. Barnes & Noble's top competitor, Amazon's Kindle, is still in the lead in overall sales of e-reader devices with an estimated 6 million sold compared to about 2 million of the Nook.