Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
453
Unknown
96
NOAA NCEI Environmental Data Archive (via DataONE)
82
PANGAEA - Data Publisher for Earth & Environmental Science
21
Defense Technical Information Center: DTIC Technical Reports database
11
Arctic Data Center (via DataONE)
9
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
9
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
7
Directory of Open Access Journals: DOAJ Articles
6
Zenodo
6
Copernicus Publications: E-Journals
3
Lund University Publications (LUP)
3
Niedersächsisches Online-Archiv NOA
3
Frontiers: Figshare
2
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
2
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
2
International Arctic Research Center (IARC) Data Archive (via DataONE)
2
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
2
Aarhus University: Research
1
Australian National University: ANU Digital Collections
1
Cambridge University Press
1
CyberLeninka (Scientific Electronic Library)
1
Delft University of Technology: Institutional Repository
1
Digital Commons University of South Florida (USF)
1
Frontiers (Publisher)
1
HighWire Press (Stanford University)
1
Institute for Marine Research: Brage IMR
1
Natural Environment Research Council: NERC Open Research Archive
1
Norwegian Institute for Water research: NIVA Open Access Archive (Brage)
1
OPUS - Publication Server of the University of Stuttgart
1
OpenAgrar (OA)
1
Polar Research
1
PubMed Central (PMC)
1
RWTH Aachen University: RWTH Publications
1
Springer Nature (via Crossref)
1
Stockholm University: Publications (DiVA)
1
The Winnower
1
University College London: UCL Discovery
1
University of Groningen research database
1
University of South Florida St. Petersburg: Digital USFSP
1
University of Southampton: e-Prints Soton
1
University of Stavanger: UiS Brage
1
University of Tromsø: Munin Open Research Archive
1
Xiamen University Institutional Repository
1