This PLACESC TO GET COLLEGE TEXTBOOKS FREE
- Bookboon. https://bookboon.com/
- OpenStax. https://openstax.org/
- Open Textbook Library. https://open.umn.edu/opentextbooks
- Saylor Academy. https://www.saylor.org/books/
- IntechOpen. https://www.intechopen.com/
- Textbook Revolution. http://www.textbookrevolution.org/index.php/Main_Page
- Online Mathematics Textbooks. http://people.math.gatech.edu/~cain/textbooks/onlinebooks.html
- Project Gutenberg. http://www.gutenberg.org/wiki/Main_Page
- wikibooks https://en.wikibooks.org/wiki/Wikibooks_Stacks/Departments
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Google Hacks