Content Provider
Directory of Open Access Journals: DOAJ Articles
66
PubMed Central (PMC)
20
DataCite Metadata Store (German National Library of Science and Technology)
17
PALNI Digital Library Collections (Private Academic Library Network of Indiana)
16
HighWire Press (Stanford University)
14
Hunter Library Digital Collections (Western Carolina University)
12
University of California: eScholarship
11
University of Lethbridge Digitized Collections
11
WHO (World Health Organization): Institutional Repository for Information Sharing (IRIS)
10
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
8
The BMJ
8
Umeå University: Publications (DiVA)
7
Unknown
6
Wiley Online Library
6
Aurora Health Care Digital Repository
4
BioMed Central
4
HRB National Drugs Library (Health Research Board)
4
VADS (Visual Arts Data Service - University for the Creative Arts, Farnham)
4
CDC Stacks (Centers for Disease Control and Prevention)
3
Columbia University: Academic Commons
3
Hirsla - Landspítali University Hospital research archive
3
Imperial College London: Spiral
3
Oxford University Press (via Crossref)
3
The University of Utah: J. Willard Marriott Digital Library
3
University of Glasgow: Enlighten - Publications
3
University of Stirling: Stirling Digital Research Repository
3
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
2
CyberLeninka (Scientific Electronic Library)
2
DIAL@UCLouvain (Université catholique de Louvain)
2
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
Jultika - University of Oulu repository
2
Karolinska Institutet: Publications
2
Loyola University Chicago Digital Special Collections
2
Memorial University of Newfoundland: Research Repository
2
National Chengchi University Institutional Repository (NCCUIR)
2
National Institute for Health and Welfare (THL), Finland: Julkari
2
National Taiwan University Institutional Repository (NTUR)
2
North Dakota State University (NDSU): Digital Horizons
2
Oxford University Press
2
Radboud University: DSpace
2
RePEc (Research Papers in Economics)
2
Repositorio Universidad de los Llanos
2
SAGE Publications
2
Siberian journal of oncology
2
Springer Nature (via Crossref)
2
The Research Repository @ WVU (West Virginia University)
2
The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive)
2
The University of Milan: Archivio Istituzionale della Ricerca (AIR)
2
Theses Canada/Thèses Canada (Library and Archives Canada)
2
U.S. National Library of Medicine (NLM): Images from the History of Medicine (IHM)
2
more ...