From an interesting new startup called Flatworld:
"We preserve the best of the old - books by leading experts, rigorously reviewed and developed to the highest standards. Then we flip it all on its head.
Our books are free online. We offer convenient, low-cost choices for students – softcovers for under $30, audio books and chapters, self-print options, and more. Our books are open for instructors to modify and make their own (for their own course - not for anybody else's). Our books are the hub of a social learning network where students learn from the book and each other."
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