George Mason University's OER MetafinderThe Mason OER Metafinder helps you find Open Educational Resources by searching well-known OER repositories like OpenStax, OER Commons, MERLOT but also sites like HathiTrust, DPLA, Internet Archive and NYPL Digital Collections where valuable but often overlooked yet often “open” educational materials may be found. Given the many “standards” of metadata in the OER universe, we can’t guarantee that every item retrieved is “Open” in the strictest interpretation of that term…so make it a practice to check the rights of any item you use.