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Open Access Books
- Directory of Open Access Books
- OAPEN Library
- InTech-Open
- Project Gutenberg
- Bartleby Bookstore
- Civitas
- Free e-books
- Free Medical Books
- Google Books
- Library4Science
- Open Access Books
- The Online Books Page
- Scholarly Monograph Series
- Stanford Encyclopedia of Philosophy
- Open Library
- Planet eBook
- Library Genesis