Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
5,186
Arctic Data Center (via DataONE)
298
Unknown
273
LeibnizOpen (The Leibniz Association)
199
Directory of Open Access Journals: DOAJ Articles
193
Copernicus Publications: E-Journals
162
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
139
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
136
Niedersächsisches Online-Archiv NOA
108
Université de Nantes: HAL-UNIV-NANTES
103
Natural Environment Research Council: NERC Open Research Archive
95
PANGAEA - Data Publisher for Earth & Environmental Science
91
Zenodo
83
University of California: eScholarship
74
NASA Technical Reports Server (NTRS)
65
Cambridge University Press
63
BORIS (Bern Open Repository and Information System, University of Bern)
59
Utrecht University Repository
58
Defense Technical Information Center: DTIC Technical Reports database
52
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
39
PubMed Central (PMC)
36
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
32
Max Planck Society: MPG.PuRe
32
University of Southampton: e-Prints Soton
31
eCite UTAS (University of Tasmania)
31
Australian National University: ANU Digital Collections
30
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
30
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
28
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
27
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
27
NOAA NCEI Environmental Data Archive (via DataONE)
26
Springer Nature (via Crossref)
25
Université Grenoble Alpes: HAL
25
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
24
White Rose Research Online (Universities of Leeds, Sheffield & York)
24
DIAL@USL-B (Université Saint-Louis, Bruxelles)
22
DIAL@UCLouvain (Université catholique de Louvain)
21
University of Copenhagen: Research
21
Digital.CSIC (Spanish National Research Council)
19
IEDA: US Antarctic Program Data Center (via DataONE)
19
Institut national des sciences de l'Univers: HAL-INSU
19
Lund University Publications (LUP)
19
MDPI Open Access Publishing
19
University College London: UCL Discovery
19
Ohio State University (OSU): Knowledge Bank
18
Durham University: Durham Research Online
17
University of Bristol: Bristol Research
17
Apollo - University of Cambridge Repository
16
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
16
ScholarsArchive@OSU (Oregon State University)
16
more ...