Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
5,239
Arctic Data Center (via DataONE)
298
Unknown
284
LeibnizOpen (The Leibniz Association)
215
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)
139
Institut national des sciences de l'Univers: HAL-INSU
119
Niedersächsisches Online-Archiv NOA
109
Université de Nantes: HAL-UNIV-NANTES
103
PANGAEA - Data Publisher for Earth & Environmental Science
97
Natural Environment Research Council: NERC Open Research Archive
95
Zenodo
86
University of California: eScholarship
75
Cambridge University Press
74
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
72
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
69
Université Grenoble Alpes: HAL
68
NASA Technical Reports Server (NTRS)
65
Utrecht University Repository
61
BORIS (Bern Open Repository and Information System, University of Bern)
59
Université Savoie Mont Blanc: HAL
55
Defense Technical Information Center: DTIC Technical Reports database
52
University of Copenhagen: Research
47
University of Bristol: Bristol Research
42
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
39
PubMed Central (PMC)
36
University of Southampton: e-Prints Soton
34
Archives ouvertes de Paris-Saclay
33
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
32
Max Planck Society: MPG.PuRe
32
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
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
27
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
Technical University of Denmark: DTU Orbit
26
Springer Nature (via Crossref)
25
White Rose Research Online (Universities of Leeds, Sheffield & York)
24
DIAL@USL-B (Université Saint-Louis, Bruxelles)
22
Lund University Publications (LUP)
22
University of Liège: ORBi (Open Repository and Bibliography)
22
Caltech Authors (California Institute of Technology)
21
DIAL@UCLouvain (Université catholique de Louvain)
21
Delft University of Technology: Institutional Repository
19
Digital.CSIC (Spanish National Research Council)
19
more ...