Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,515
NOAA NCEI Environmental Data Archive (via DataONE)
27
WikiBooks - Open-content textbooks
20
Research Data Australia (Australian National Data Service - ANDS)
15
Directory of Open Access Journals: DOAJ Articles
14
Unknown
9
Defense Technical Information Center: DTIC Technical Reports database
6
GFZ Data Services (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
6
Copernicus Publications: E-Journals
5
PubMed Central (PMC)
5
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
4
Digital.CSIC (Spanish National Research Council)
4
NASA Technical Reports Server (NTRS)
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
Université de Nantes: HAL-UNIV-NANTES
4
Wiley Online Library
4
Aarhus University: OJS at The State and University Library
3
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3
Arctic Data Center (via DataONE)
3
David Rumsey Historical Map Collection (Cartography Associates)
3
Natural Environment Research Council: NERC Open Research Archive
3
Niedersächsisches Online-Archiv NOA
3
Tidsskrift.dk (The Royal Library, Denmark)
3
University of Hong Kong: HKU Scholars Hub
3
CyberLeninka (Scientific Electronic Library)
2
Georg-August-Universität Göttingen: GoeScholar
2
Indian Academy of Sciences: Publication of Fellows
2
Informa (via Crossref)
2
Magnolia press
2
National Institute of Polar Research Repository, Japan
2
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
2
University of California: eScholarship
2
University of Southampton: e-Prints Soton
2
University of Southern Queensland: USQ ePrints
2
eCite UTAS (University of Tasmania)
2
eLife (E-Journal - via Crossref)
2
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
ArXiv.org (Cornell University Library)
1
Arctic Institute of North America
1
Arctic Portal Library
1
Arctic and Antarctic Research
1
Arctic and Antarctic Research (E-Journal)
1
BORIS (Bern Open Repository and Information System, University of Bern)
1
Bangladesh Journals Online (BanglaJOL)
1
Bogor Agricultural University: IPB Scientific Repository (Institut Pertanian Bogoar)
1
Brigham Young University (BYU): Digital Collections
1
Central Marine Fisheries Research Institute, Kochi, India: Eprints@CMFRI
1
Curtin University: espace
1
DIAL@UCLouvain (Université catholique de Louvain)
1
DIAL@USL-B (Université Saint-Louis, Bruxelles)
1
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