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:
Pure Diversity / Diversidad Pura ©1993 Mirta Toledo. Mixed media on cotton paper. Made in Fort Worth, Texas. This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
This is a sample of several OER books and course materials. Additional OER may be found by searching the resources listed on the ACC Libraries primary Open Educational Resources Guide.