These are just examples of the types of OER that can be used to replace textbooks. You can use the Find OER more materials.
Art
Behavioral Sciences
Communication & Media Studies
English & World Languages
History & Political Sciences
Music
Agriculture & Tourism
School of Business
Emergency Management, Professional Studies, & Student Affairs Administration
Kinesiology & Rehabilitation Sciences
Nursing
Teaching & Educational Leadership
Biological Sciences
Engineering & Computer Sciences
Mathematics & Statistics
Physical & Earth Sciences