Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
648
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
Biodiversity Heritage Library (BHL)
26
ScienceDirect (Elsevier - via Crossref)
26
WikiBooks - Open-content textbooks
22
ScienceDirect (Elsevier)
21
Texas A&M University Digital Repository
19
Wiley Online Library (via Crossref)
19
MDPI Open Access Publishing
16
Cambridge University Press
15
Dipòsit Digital de la Universitat de Barcelona
15
PubMed Central (PMC)
15
Université de Nantes: HAL-UNIV-NANTES
15
HAL Sorbonne Université
13
Institut national des sciences de l'Univers: HAL-INSU
13
Magnolia press
13
eCite UTAS (University of Tasmania)
13
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
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
8
Journals at the University of Arizona
8
Stellenbosch University: SUNScholar Research Repository
8
University of Tasmania: UTas ePrints
8
Arctic Portal Library
7
Australian National University: ANU Digital Collections
7
Niedersächsisches Online-Archiv NOA
7
Aix-Marseille Université: HAL
6
University of North Texas: UNT Digital Library
6
Università degli Studi di Genova: CINECA IRIS
6
KU Leuven: Lirias
5
University of St Andrews: Digital Research Repository
5
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
5
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
Université de Bretagne Occidentale: HAL
4
more ...