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BookSC - The world's Largest E-books and Scientific Articles Store as Free

The world's largest e-books and scientific articles store. 50,000,000+ articles and  2,800,000 ebooks for free download as PDF, epub...etc. for free
This site aims to make literature accessible to everyone.
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Baen Free Library

Baen Books is now making available — for free — a number of its titles in electronic format. We're calling it the Baen Free Library. Anyone who wishes can read these titles online — no conditions, no strings attached. (Later we may ask for an extremely simple, name & email only, registration. ) Or, if you prefer, you can download the books in one of several formats. Again, with no conditions or strings attached. (URLs to sites which offer the readers for these format are also listed.