Amazon celebrates its first '$10 billion quarter' in sales, finds Kindle books overtaking paperbacks

Engadget: July 19, 2010 marked the day that Amazon's digital book sales eclipsed the sales of hardcover books, and it barely took half a year for those e-book sales to also overtake the sales of paperbacks. According to the ouftit's latest earnings release, "Kindle books have now overtaken paperback books as the most popular format on"

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