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The figures show impressive increases across the board in a year where e-book popularity - in particular the likes of Fifty Shades of Grey - hit the headlines for racking up massive sales.
BBC: Fifty Shades of Grey
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Author EL James released a limited print run of her book, Fifty Shades of Grey, but success came from e-book and print sales combined.
BBC: Erotica e-book offshoot launched by HarperCollins
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The genre even has its first best-seller, "Fifty Shades of Grey, " by E L James, a British mother and former TV producer.
WSJ: How Kindle, Nook and iPad Fuel Sales of Erotica for Women
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"Fifty Shades" was released last May through the Writer's Coffee Shop, an Australian independent e-publisher, and by fall it had become a grassroots sensation in the U.S., as affluent young mothers devoured the racy tale and recommended it to friends.
WSJ: How Kindle, Nook and iPad Fuel Sales of Erotica for Women