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  1. openstax.org
    https://openstax.org

    OpenStax | Free Textbooks Online with No Catch

  2. openstax.org
    https://openstax.org/subjects

    Subjects - OpenStax

  3. openstax.org
    https://openstax.org/details/books/calculus-volume-1

    Calculus Volume 1 - OpenStax

  4. openstax.org
    https://openstax.org/details/books/biology

    Biology 2e - OpenStax

  5. openstax.org
    https://openstax.org/details/books/college-physics

    College Physics 2e - OpenStax

  6. openstax.org
    https://openstax.org/details/books/us-history

    U.S. History - OpenStax

  7. openstax.org
    https://openstax.org/details/books/college-algebra

    College Algebra 2e - OpenStax

  8. openstax.org
    https://openstax.org/details/books/chemistry

    Chemistry 2e - OpenStax

  9. openstax.org
    https://openstax.org/blog/introducing-free-textbook

    Introducing Free the Textbook - OpenStax

  10. openstax.org
    https://openstax.org/details/books/anatomy-and-physiology

    Anatomy and Physiology 2e - OpenStax