3027.Resource, Open Source, Free Online Textbooks (High)

This was copied directly from the weblink:  "Expert Authors - Our open source textbooks are written by professional content developers who are experts in their fields. Standard Scope and Sequence - All textbooks meet standard scope and sequence requirements, making them seamlessly adaptable into existing courses. Peer Reviewed - OpenStax textbooks undergo a rigorous peer review process. You can view the list of contributors when you click on each book. With philanthropic support, our books have been used in 38,143 classrooms, saving students $1,783,506,230 since 2012."