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It’s a shame more people are not aware of the wide array of free online libraries. Databases, books, videos, audio recordings and e-books are available, just waiting to be viewed and used.
This is a listing of 714 sites that legally offer free books (eBooks) for download or for online viewing. For a complete listing of the free ebook pages here at Gizmo's, see Millions of Free eBooks and Audio Books Online
Many Books is a great resource of free ebooks for teachers. It has indexed more than 29.000 free ebook in a variety of format and for different devices.