"Open Educational Resources" by Ron Mader is licensed under CC BY 2.0
OER are teaching, learning, and research resources that reside in the public domain or have been released under an intellectual property license that permits their free use and re-purposing by others. ~ William & Flora Hewlett Foundation
For a more comprehensive overview on OER, see:
"Austin Community College Vet Tech Program" by Austin Community College is licensed under CC BY 2.0
This is a sample of several OER veterinary textbooks or course materials available. Additional OER in your subject may be found by searching the resources listed on the ACC Libraries primary Open Educational Resources Guide or check out Virginia Tech's Open Educational Resources portal for Veterinary Medicine.
Open Access materials can be found, but use them thoughtfully and with caution; they may be outdated.