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Open Educational Resources (OER) are "learning, teaching and research materials in any format and medium that reside in the public domain or are under copyright that have been released under an open license, that permit no-cost access, re-use, re-purpose, adaptation and redistribution by others" (UNESCO, 2019).
"Textbook costs should not be a barrier to education." "Students learn more when they have access to quality materials."
—SPARC