Open Textbook Library.

https://open.umn.edu/opentextbooks/

Transform Higher Education and Student Learning
Open textbooks are licensed by authors and publishers to be freely used and adapted. Download, edit and distribute them at no cost.

Now offering 1323 open textbooks, the Open Textbook Library is supported by the Open Education Network.



There are both search, and listing by subject.
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CENTER FOR OPEN EDUCATION | The Open Education Network is based in the Center for Open Education in the University of Minnesota’s College of Education and Human Development.
University of Minnesota, 330 Wulling Hall, 86 Pleasant Street S.E., Minneapolis, MN 55455

Attribution License Except where otherwise noted, content on this site is licensed under a Creative Commons Attribution 4.0 License

Personal Note: to ban books, you have to in effect ban the internet. Filters are flawed.