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Affiliation
- Oregon State University20
- Portland State University19
- National Academies Press (NAP)18
- National Central Library 國家圖書館12
- Rice University12
- Franklin W. Olin College of Engineering9
- Kansas State University9
- North Carolina State University9
- University of Denver9
- University of Michigan9
- Western Washington University9
- Athabasca University8
- DOAB (Directory of Open Access Books)8
- Grand Valley State University8
- New York Law School8
- Open Textbook Library8
- OAPEN (Open Access Publishing in European Networks) Foundation7
- University of Arkansas7
- University of Minnesota7
- University of Oklahoma7