Content Provider
Arctic Data Center (via DataONE)
146
DataCite Metadata Store (German National Library of Science and Technology)
77
PANGAEA - Data Publisher for Earth & Environmental Science
75
Unknown
40
WikiBooks - Open-content textbooks
27
Directory of Open Access Journals: DOAJ Articles
24
Defense Technical Information Center: DTIC Technical Reports database
20
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
16
NOAA NCEI Environmental Data Archive (via DataONE)
13
University of Calgary Journal Hosting
12
Copernicus Publications: E-Journals
11
Washington State University: WSU Libraries Digital Collections
11
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
10
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
10
Cambridge University Press
8
Institut national des sciences de l'Univers: HAL-INSU
8
University College London: UCL Discovery
8
Université de Nantes: HAL-UNIV-NANTES
8
Niedersächsisches Online-Archiv NOA
6
University of Southampton: e-Prints Soton
6
National Library of Australia: Digital Collections
5
Natural Environment Research Council: NERC Open Research Archive
5
University of Wollongong, Australia: Research Online
5
Jagiellonian University Repository
4
Lund University Publications (LUP)
4
Naval Postgraduate School: Calhoun
4
PubMed Central (PMC)
4
University of Bergen: Bergen Open Research Archive (BORA-UiB)
4
University of Tromsø: Munin Open Research Archive
4
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
4
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
3
Arctic and Antarctic Research
3
Brill (via Crossref)
3
Digital.CSIC (Spanish National Research Council)
3
ScienceDirect (Elsevier - via Crossref)
3
USGS Science Data Catalog (via DataONE)
3
University of Rhode Island: DigitalCommons@URI
3
CESSDA DC Data Catalogue (Consortium of European Social Science Data Archives)
2
CyberLeninka (Scientific Electronic Library)
2
DataCite
2
DergiPark Akademik (E-Journals)
2
Digital Repository of Scientific Institutes (RCIN)
2
Georg-August-Universität Göttingen: GoeScholar
2
Hereon Publications (Helmholtz-Zentrum)
2
Hrčak - Portal of scientific journals of Croatia
2
Institute for Marine Research: Brage IMR
2
International Arctic Research Center (IARC) Data Archive (via DataONE)
2
MDPI Open Access Publishing
2
Max Planck Society: MPG.PuRe
2
National Institute of Polar Research Repository, Japan
2
more ...