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Affiliation
- Massachusetts Institute of Technology21
- University of California, Irvine16
- University of Michigan6
- National Academies Press (NAP)5
- National Central Library 國家圖書館5
- Hong Kong Polytechnic University3
- City University of Hong Kong2
- DOAB (Directory of Open Access Books)2
- Hong Kong Baptist University2
- Idaho State University2
- InTechOpen2
- Johns Hopkins University2
- OAPEN (Open Access Publishing in European Networks) Foundation2
- Open Textbook Library2
- U.S. National Library of Medicine2
- University of Oxford2
- Ivy Tech State College1
- Aims Community College1
- Arapahoe Community College1
- BBC1