Content Provider
Directory of Open Access Journals: DOAJ Articles
927
DataCite Metadata Store (German National Library of Science and Technology)
820
Unknown
776
Wiley Online Library
617
ScienceDirect (Elsevier - via Crossref)
486
Wiley Online Library (via Crossref)
449
Open Parks Network
425
Springer Nature (via Crossref)
414
PubMed Central (PMC)
404
Canadian Science Publishing (via Crossref)
254
PANGAEA - Data Publisher for Earth & Environmental Science
216
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
205
University of Calgary Journal Hosting
190
Copernicus Publications: E-Journals
187
University of Copenhagen: Research
176
MDPI Open Access Publishing
168
Defense Technical Information Center: DTIC Technical Reports database
166
Lund University Publications (LUP)
164
Informa (via Crossref)
154
ScienceDirect (Elsevier)
153
University of Tromsø: Munin Open Research Archive
150
Niedersächsisches Online-Archiv NOA
134
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
129
HighWire Press (Stanford University)
123
Université de Nantes: HAL-UNIV-NANTES
122
Natural Resources Institute Finland: Jukuri
115
Institut national des sciences de l'Univers: HAL-INSU
113
HELDA – University of Helsinki Open Repository
111
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
110
Cambridge University Press
97
Aarhus University: Research
92
Theses Canada/Thèses Canada (Library and Archives Canada)
91
Umeå University: Publications (DiVA)
89
Canadian Science Publishing
88
Vrije Universiteit Amsterdam (VU): Research Portal
72
University of Alaska: ScholarWorks@UA
71
Oxford University Press (via Crossref)
68
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
66
Oxford University Press
65
LeibnizOpen (The Leibniz Association)
62
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
58
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
58
ScholarsArchive@OSU (Oregon State University)
57
Informa
56
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
49
University of British Columbia: cIRcle - UBC's Information Repository
48
HAL Sorbonne Université
46
BioOne Online Journals
45
Jultika - University of Oulu repository
45
LaCRIS - University of Lapland Current Research System
43
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