List of 15 sites where you can download millions of books for free
1. Google Books
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1. Google Books
2. OpenCulture
3. LibGen
4. Internet Archive
5. Subbook
6. ManyBooks
7. OpenLibrary
8. Good Reads
9. Free-ebooks
10. Bookboon
11. PDFBooks World
12. Obooko
13. O'Reilly
14. E-BookLobby
15. Project Gutenberg