Content Provider
Directory of Open Access Journals: DOAJ Articles
21
Defense Technical Information Center: DTIC Technical Reports database
8
Unknown
8
Institute for Marine Research: Brage IMR
6
PANGAEA - Data Publisher for Earth & Environmental Science
6
DataCite Metadata Store (German National Library of Science and Technology)
5
MDPI Open Access Publishing
5
PubMed Central (PMC)
5
Wiley Online Library
5
Cambridge University Press
4
Springer Nature (via Crossref)
4
University of Tromsø: Munin Open Research Archive
3
HELDA – University of Helsinki Open Repository
2
HighWire Press (Stanford University)
2
Magnolia press
2
Masaryk University Journals
2
Norwegian Institute for Nature Research: Brage NINA
2
University of Calgary Journal Hosting
2
University of Tromsø: Septentrio Academic Publishing
2
Aarhus University: Research
1
Copernicus Publications: E-Journals
1
DIAL@USL-B (Université Saint-Louis, Bruxelles)
1
DR-NTU (Digital Repository at Nanyang Technological University, Singapore)
1
Digital Repository of Scientific Institutes (RCIN)
1
Digital.CSIC (Spanish National Research Council)
1
Federation of Finnish Learned Societies: Scientific Journals Online
1
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
1
Freie Universität Berlin: Refubium (FU Berlin)
1
Geography, Environment, Sustainability (E-Journal)
1
Ghent University Academic Bibliography
1
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
1
IRUA - Institutional Repository van de Universiteit Antwerpen
1
Journals at the University of Arizona
1
Jultika - University of Oulu repository
1
Justus-Liebig-Universität Giessen: JLUpub
1
KU VL (Klaipėdos universitetas Virtual Library)
1
NIOZ Repository (Royal Netherlands Institute for Sea Research)
1
Niedersächsisches Online-Archiv NOA
1
Norwegian Computing Center: NR vitenarkiv
1
Norwegian Institute for Water research: NIVA Open Access Archive (Brage)
1
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1
PEARL (Plymouth Electronic Archiv & ResearchLibrary, Plymouth University)
1
Pensoft Publishers
1
Publication Server of the Justus-Liebig-University of Giessen
1
The University of Liverpool Repository
1
UNESDOC - UNESCO Digital Library
1
University of Groningen research database
1
Wiley Online Library (via Crossref)
1
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
1