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OER (Open Educational Resources)
DOAB (Directory of Open Access Books)
According to the web site, "DOAB is a community-driven discovery service that indexes and provides access to scholarly, peer-reviewed open access books and helps users to find trusted open access book publishers. "
DPLA (Digital Public Library of America)
According to the web site, "The Digital Public Library of America empowers people to learn, grow, and contribute to a diverse and better-functioning society by maximizing access to our shared history, culture, and knowledge."
HathiTrust
According to the web site, "The mission of HathiTrust is to contribute to research, scholarship, and the common good by collaboratively collecting, organizing, preserving, communicating, and sharing the record of human knowledge."
Mason OER Metafinder
According to the web site, "The Mason OER Metafinder helps you find Open Educational Resources. Unlike other OER discovery sites (e.g, OER Commons, OASIS, MERLOT, OpenStax, etc.) with our Metafinder you aren’t searching a static database that we’ve built. Instead, the OER Metafinder launches a real-time, simultaneous search across 22 different sources of open educational materials as you hit the Search button."
OER Commons
According to the web site, "OER Commons is a public digital library of open educational resources."