Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
3,591
PANGAEA - Data Publisher for Earth & Environmental Science
1,178
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
395
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
350
Directory of Open Access Journals: DOAJ Articles
211
Arctic Data Center (via DataONE)
200
Unknown
109
Copernicus Publications: E-Journals
78
NOAA NCEI Environmental Data Archive (via DataONE)
59
Niedersächsisches Online-Archiv NOA
54
Zenodo
50
MDPI Open Access Publishing
47
Springer Nature (via Crossref)
36
Springer Nature
31
Frontiers: Figshare
30
ScienceDirect (Elsevier - via Crossref)
28
Wiley Online Library
23
Defense Technical Information Center: DTIC Technical Reports database
22
Polar Research (E-Journal)
17
PubMed Central (PMC)
16
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
15
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
14
Arctic and Antarctic Research (E-Journal)
13
CyberLeninka (Scientific Electronic Library)
13
Frontiers (Publisher)
13
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
13
Max Planck Society: MPG.PuRe
12
Tomsk Polytechnic University (TPU): Electronic Archive
12
Vrije Universiteit Amsterdam (VU): Research Portal
12
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
12
Ice and Snow (E-Journal)
11
Natural Environment Research Council: NERC Open Research Archive
11
CentAUR: Central Archive at the University of Reading
9
Hereon Publications (Helmholtz-Zentrum)
9
IOP Publishing (via Crossref)
9
Institut national des sciences de l'Univers: HAL-INSU
9
ScienceDirect (Elsevier)
9
USGS Science Data Catalog (via DataONE)
9
Aarhus University: Research
8
KovsieScholar Repository (University of the Free State - UFS UV)
8
University of Southampton: e-Prints Soton
8
University of Tromsø: Munin Open Research Archive
8
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
7
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
7
ScholarsArchive@OSU (Oregon State University)
7
University College London: UCL Discovery
7
Université de Nantes: HAL-UNIV-NANTES
7
Wiley Online Library (via Crossref)
7
Digital.CSIC (Spanish National Research Council)
6
GEO-LEOe-docs (FID GEO)
6
more ...