Open Textbook Library's books have been reviewed by faculty from a variety of colleges and universities to assess their quality. All textbooks are either used at multiple higher education institutions; or affiliated with an institution, scholarly society, or professional organization. Initiative of the University of Minnesota.
OER published at a number of colleges and universities including Portland State University, University of Massachusetts, University of Pennsylvania, University of South Florida, the City University of New York, and Utah State University. To find open textbooks, select "textbooks" under "types of works."