Open Educational Resources (OERs) are freely available teaching materials, such as, textbooks, lesson plans, activities, media, and supporting content. They're a type of open access material.
OER and related materials can be found on multiple websites from multiple sources. These tools can help you find them:
eBooks can be found from the main USC Libraries' Search.
eBook collections can also be browsed through various subscription databases. Some selected databases are below, but the full list can be found on our databases page. We also have a guide to eBooks that may be helpful including "Using eBooks For A Course?"