Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
640
National Institute of Polar Research Repository, Japan
120
Unknown
89
Directory of Open Access Journals: DOAJ Articles
84
Digital.CSIC (Spanish National Research Council)
53
DataCite Metadata Store (German National Library of Science and Technology)
52
Instituto Español de Oceanografía: e-IEO
45
UNESDOC - UNESCO Digital Library
41
Springer Nature (via Crossref)
38
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
28
ScienceDirect (Elsevier - via Crossref)
28
Biodiversity Heritage Library (BHL)
26
WikiBooks - Open-content textbooks
22
ScienceDirect (Elsevier)
19
Texas A&M University Digital Repository
19
Wiley Online Library (via Crossref)
19
MDPI Open Access Publishing
16
Dipòsit Digital de la Universitat de Barcelona
15
PubMed Central (PMC)
15
Université de Nantes: HAL-UNIV-NANTES
15
Institut national des sciences de l'Univers: HAL-INSU
13
Magnolia press
13
eCite UTAS (University of Tasmania)
13
Cambridge University Press
12
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
10
HighWire Press (Stanford University)
10
Rhodes University Cory: Repository
10
SEALS Digital Commons (South East Academic Libraries System, South Africa)
10
University of Groningen research database
10
Copernicus Publications: E-Journals
9
Defense Technical Information Center: DTIC Technical Reports database
9
Journals at the University of Arizona
8
Stellenbosch University: SUNScholar Research Repository
8
University of Tasmania: UTas ePrints
8
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
7
Arctic Portal Library
7
Australian National University: ANU Digital Collections
7
HAL Sorbonne Université
7
Niedersächsisches Online-Archiv NOA
7
University of North Texas: UNT Digital Library
6
Università degli Studi di Genova: CINECA IRIS
6
Aix-Marseille Université: HAL
5
KU Leuven: Lirias
5
University of St Andrews: Digital Research Repository
5
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
5
Informa (via Crossref)
4
National Institute of Oceanography, India: Digital Repository Service (DRS@nio)
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
University of California: eScholarship
4
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
4
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