There are several aggregator sites that can be used to find OERs or links to them. Below are several:
The following site allows you to search for specific repositories:
Many states host OER sites for materials created by their schools.
Below are a number of more focused sources of OERs:
There are a number of sources of OERs that are geared towards primary and secondary students.
There are several sites that allow you to search for open access books, books that were purposefully written for open access or books that have fallen into public domain. Open books are not necessarily OERs, but you can find some in these sites.
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