Content Provider
National Library of Australia: Digital Collections
678
PANGAEA - Data Publisher for Earth & Environmental Science
644
DataCite Metadata Store (German National Library of Science and Technology)
257
Digital.CSIC (Spanish National Research Council)
166
Instituto Español de Oceanografía: e-IEO
164
National Institute of Polar Research Repository, Japan
140
California State University (CSU): DSpace
104
Unknown
103
Directory of Open Access Journals: DOAJ Articles
85
UNESDOC - UNESCO Digital Library
82
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
58
Research Data Australia (Australian National Data Service - ANDS)
53
Springer Nature (via Crossref)
45
Zenodo
43
Biodiversity Heritage Library (BHL)
36
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
32
ScienceDirect (Elsevier - via Crossref)
28
WikiBooks - Open-content textbooks
22
Texas A&M University Digital Repository
20
University of Washington, Seattle: Digital Collections
20
Wiley Online Library (via Crossref)
20
ScienceDirect (Elsevier)
19
Université de Nantes: HAL-UNIV-NANTES
17
MDPI Open Access Publishing
16
NOAA NCEI Environmental Data Archive (via DataONE)
16
Dipòsit Digital de la Universitat de Barcelona
15
IEDA: US Antarctic Program Data Center (via DataONE)
15
PubMed Central (PMC)
15
Cambridge University Press
14
Institut national des sciences de l'Univers: HAL-INSU
13
Magnolia press
13
University of Tasmania: UTas ePrints
13
eCite UTAS (University of Tasmania)
13
University of Groningen research database
11
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
10
Australian National University: ANU Digital Collections
10
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
10
HighWire Press (Stanford University)
10
IEDA: Marine-Geo Digital Library (via DataONE)
10
Repositório Digital do IPEN (Instituto de Pesquisas Energéticas e Nucleares)
10
Rhodes University Cory: Repository
10
SEALS Digital Commons (South East Academic Libraries System, South Africa)
10
Copernicus Publications: E-Journals
9
Defense Technical Information Center: DTIC Technical Reports database
9
Stellenbosch University: SUNScholar Research Repository
9
HAL Sorbonne Université
8
Journals at the University of Arizona
8
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
8
Arctic Portal Library
7
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
7
more ...