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15 books you didn't know were first available through Kindle Direct Publishing, including 'The Martian' and 'Fifty Shades of Grey'
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Fifty Shades of Grey books outsell Harry Potter on Amazon.co.uk - Gear | siliconrepublic.com - Ireland's Technology News Service
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Fifty Shades of Grey 10th Anniversary Edition (Fifty Shades of Grey Series, 1): James, E L: 9781728260839: Amazon.com: Books
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Fifty Shades of Grey,' 10 years later: Self-publishing wasn't novel then, but now it's easier to reach a niche audience
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