Content Provider
Directory of Open Access Journals: DOAJ Articles
112
ScienceDirect (Elsevier - via Crossref)
60
Wiley Online Library
57
DataCite Metadata Store (German National Library of Science and Technology)
56
University of Calgary Journal Hosting
55
University of California: eScholarship
32
University of North Texas: UNT Digital Library
30
Wiley Online Library (via Crossref)
26
RePEc (Research Papers in Economics)
25
Niedersächsisches Online-Archiv NOA
22
Unknown
20
Cambridge University Press
17
Informa (via Crossref)
14
Springer Nature (via Crossref)
14
ScienceDirect (Elsevier)
13
Arctic Institute of North America (via Crossref)
12
ACS Publications
11
University of Alaska: ScholarWorks@UA
10
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
10
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
9
Canadian Science Publishing
9
Informa
9
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
8
Canadian Science Publishing (via Crossref)
8
Frontiers (Publisher)
7
IOP Publishing
6
Wageningen UR (University & Research Centre): Digital Library
6
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR
5
Institut national des sciences de l'Univers: HAL-INSU
5
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
5
Oxford University Press
5
Université de Nantes: HAL-UNIV-NANTES
5
ASM Journals (American Society for Microbiology)
4
Caltech Authors (California Institute of Technology)
4
National Research Council Canada: NRC Publications Archive
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
The University of Manchester: Research Explorer
4
University of Michigan: Deep Blue
4
Aarhus University: Research
3
Biodiversity Heritage Library (BHL)
3
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
3
JSTOR (via Crossref)
3
SAGE Publications
3
The Canadian Field-Naturalist (E-Journal)
3
Vrije Universiteit Amsterdam (VU): Research Portal
3
White Rose Research Online (Universities of Leeds, Sheffield & York)
3
Zenodo
3
ACS Publications (via Crossref)
2
ASM Journals (American Society for Microbiology - via Crossref)
2
Archive Ouverte de l'Université Rennes (HAL)
2
more ...