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Jefferson Community College OER textbooks: OER textbooks organized by faculty member
See Josh Dickinson's Guide to Creating Open Educational Resources for instructions and tips on making your own OER.
Take a look at the OER your colleagues are using, adopting and adapting. Some are also create their own materials, custom-made for their instruction program.
While Chris did not adopt or create an online textbook, she did create open access learning materials that complement a traditional print textbook for her instruction program.