Content Provider
Unknown
194
Directory of Open Access Journals: DOAJ Articles
182
PANGAEA - Data Publisher for Earth & Environmental Science
154
LeibnizOpen (The Leibniz Association)
116
DataCite Metadata Store (German National Library of Science and Technology)
114
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
93
Copernicus Publications: E-Journals
74
Université de Nantes: HAL-UNIV-NANTES
69
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
64
Niedersächsisches Online-Archiv NOA
49
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
49
PubMed Central (PMC)
49
MDPI Open Access Publishing
36
Defense Technical Information Center: DTIC Technical Reports database
34
Institut national des sciences de l'Univers: HAL-INSU
31
Springer Nature (via Crossref)
30
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
29
University of Southampton: e-Prints Soton
29
Wiley Online Library (via Crossref)
28
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
27
Max Planck Society: MPG.PuRe
25
Wiley Online Library
24
University of California: eScholarship
23
Natural Environment Research Council: NERC Open Research Archive
22
Digital.CSIC (Spanish National Research Council)
20
IRD (Institute de recherche pour le développement): Horizon
16
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
16
University of Groningen research database
15
Columbia University: Academic Commons
13
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
13
Utrecht University Repository
13
eCite UTAS (University of Tasmania)
13
Cambridge University Press
12
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
12
WikiBooks - Open-content textbooks
12
Cardiff University: ORCA (Online Research @ Cardiff)
11
CentAUR: Central Archive at the University of Reading
11
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
11
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
10
University of East Anglia: UEA Digital Repository
10
BORIS (Bern Open Repository and Information System, University of Bern)
9
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
9
HighWire Press (Stanford University)
9
National Institute of Oceanography, India: Digital Repository Service (DRS@nio)
9
ORA - Oxford University Research Archive
9
Peking University Institutional Repository (PKU IR)
9
ScienceDirect (Elsevier - via Crossref)
9
University College London: UCL Discovery
9
DSpace@MIT (Massachusetts Institute of Technology)
8
ETH Zürich Research Collection
8
more ...