Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
5,632
Unknown
448
Directory of Open Access Journals: DOAJ Articles
345
Arctic Data Center (via DataONE)
318
Copernicus Publications: E-Journals
261
LeibnizOpen (The Leibniz Association)
256
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
234
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
230
Université de Nantes: HAL-UNIV-NANTES
181
Niedersächsisches Online-Archiv NOA
176
Natural Environment Research Council: NERC Open Research Archive
140
Zenodo
137
University of California: eScholarship
125
PANGAEA - Data Publisher for Earth & Environmental Science
124
NASA Technical Reports Server (NTRS)
103
BORIS (Bern Open Repository and Information System, University of Bern)
95
Cambridge University Press
92
Utrecht University Repository
87
Defense Technical Information Center: DTIC Technical Reports database
65
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
64
PubMed Central (PMC)
63
Université Grenoble Alpes: HAL
53
Max Planck Society: MPG.PuRe
50
Institut national des sciences de l'Univers: HAL-INSU
48
eCite UTAS (University of Tasmania)
47
Australian National University: ANU Digital Collections
46
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
43
University of Copenhagen: Research
43
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
42
MDPI Open Access Publishing
42
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
42
Springer Nature (via Crossref)
41
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
39
White Rose Research Online (Universities of Leeds, Sheffield & York)
39
University of Southampton: e-Prints Soton
38
DIAL@USL-B (Université Saint-Louis, Bruxelles)
36
DIAL@UCLouvain (Université catholique de Louvain)
34
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
34
Technical University of Denmark: DTU Orbit
31
NOAA NCEI Environmental Data Archive (via DataONE)
30
National Institute of Polar Research Repository, Japan
30
ScienceDirect (Elsevier - via Crossref)
29
University of Bristol: Bristol Research
29
University College London: UCL Discovery
28
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
27
Digital.CSIC (Spanish National Research Council)
26
Durham University: Durham Research Online
25
Lund University Publications (LUP)
25
WikiBooks - Open-content textbooks
25
Wiley Online Library
25
more ...