Content Provider
Wiley Online Library
1,056
Directory of Open Access Journals: DOAJ Articles
995
Unknown
776
DataCite Metadata Store (German National Library of Science and Technology)
647
PubMed Central (PMC)
438
Open Parks Network
425
Springer Nature (via Crossref)
414
ScienceDirect (Elsevier - via Crossref)
393
ScienceDirect (Elsevier)
256
PANGAEA - Data Publisher for Earth & Environmental Science
239
DataCite
212
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
205
Copernicus Publications: E-Journals
195
University of Calgary Journal Hosting
191
University of Copenhagen: Research
183
Canadian Science Publishing
176
Canadian Science Publishing (via Crossref)
169
Lund University Publications (LUP)
168
MDPI Open Access Publishing
168
Defense Technical Information Center: DTIC Technical Reports database
166
University of Tromsø: Munin Open Research Archive
153
Niedersächsisches Online-Archiv NOA
135
HELDA – University of Helsinki Open Repository
132
Informa
130
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
129
Université de Nantes: HAL-UNIV-NANTES
124
HighWire Press (Stanford University)
123
Natural Resources Institute Finland: Jukuri
120
Institut national des sciences de l'Univers: HAL-INSU
116
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
110
Wiley Online Library (via Crossref)
104
Cambridge University Press
103
Oxford University Press
102
Umeå University: Publications (DiVA)
97
Informa (via Crossref)
96
Aarhus University: Research
94
Theses Canada/Thèses Canada (Library and Archives Canada)
91
University of Alaska: ScholarWorks@UA
73
Vrije Universiteit Amsterdam (VU): Research Portal
73
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
66
LeibnizOpen (The Leibniz Association)
65
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
58
ScholarsArchive@OSU (Oregon State University)
58
SAGE Publications
54
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
53
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
49
Digital.CSIC (Spanish National Research Council)
49
University of British Columbia: cIRcle - UBC's Information Repository
48
LaCRIS - University of Lapland Current Research System
47
HAL Sorbonne Université
46
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