Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
62
Unknown
31
Directory of Open Access Journals: DOAJ Articles
27
Defense Technical Information Center: DTIC Technical Reports database
21
PANGAEA - Data Publisher for Earth & Environmental Science
15
University of Calgary Journal Hosting
13
Xiamen University Institutional Repository
12
Copernicus Publications: E-Journals
10
Arctic Portal Library
9
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
9
ScienceDirect (Elsevier - via Crossref)
8
Niedersächsisches Online-Archiv NOA
7
Springer Nature (via Crossref)
7
Hathi Trust Digital Library
6
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
6
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
5
PubMed Central (PMC)
5
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
5
HighWire Press (Stanford University)
4
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
4
MDPI Open Access Publishing
4
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS)
4
The Hong Kong University of Science and Technology: HKUST Institutional Repository
4
University of Alaska: ScholarWorks@UA
4
Hereon Publications (Helmholtz-Zentrum)
3
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
3
Magnolia press
3
National Institute of Polar Research Repository, Japan
3
Natural Environment Research Council: NERC Open Research Archive
3
University of Southampton: e-Prints Soton
3
University of St Andrews: Research Portal
3
Université de Nantes: HAL-UNIV-NANTES
3
Cardiff University: ORCA (Online Research @ Cardiff)
2
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
2
Harvard University: Harvard Collections
2
Institut national des sciences de l'Univers: HAL-INSU
2
IssueLab (Nonprofit Research)
2
Kyoto University Research Information Repository (KURENAI)
2
ScienceDirect (Elsevier)
2
University of the Pacific, McGeorge School of Law: Scholarly Commons
2
University of the Pacific: Scholarly Commons
2
Washington State University: WSU Libraries Digital Collections
2
Aarhus University: Research
1
Alces (A Journal Devoted to the Biology and Management of Moose)
1
Apollo - University of Cambridge Repository
1
Cambridge University Press
1
City University of New York: CUNY Academic Works
1
De Gruyter
1
Digital Repository @ Iowa State University
1
Digital.CSIC (Spanish National Research Council)
1
more ...