F-READ-OM.
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Here's a list of the over 8,000 ebook titles you can read for free. Project Gutenberg is another great resource for free, downloadable ebooks.
Pixel of Ink and Centsless Books feature ebooks that are free or sold at a deep discount for a limited time. Open Library is a site where you can borrow or read over 1 million titles.
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21 Things You Didn't Know You Could Do With Your Kindle