Mashable - E-books have hit a significant milestone. In each of the last three months, Amazon reports that sales of books for Kindle have outpaced the sale of hardcover books, and that growth is only accelerating.
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Mashable - E-books have hit a significant milestone. In each of the last three months, Amazon reports that sales of books for Kindle have outpaced the sale of hardcover books, and that growth is only accelerating.
Source