Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
987
Knowledge Network for Biocomplexity (via DataONE)
142
Arctic Data Center (via DataONE)
139
University of Alaska: ScholarWorks@UA
48
Unknown
45
Directory of Open Access Journals: DOAJ Articles
36
PubMed Central (PMC)
29
Wiley Online Library
28
University of Calgary Journal Hosting
20
USGS Science Data Catalog (via DataONE)
19
University of Washington, Seattle: Digital Collections
18
Research Workspace (via DataONE)
16
Washington State University: WSU Libraries Digital Collections
13
Oxford University Press
10
BioOne Online Journals
9
Dryad Digital Repository (Duke University)
9
Hathi Trust Digital Library
9
Arctic Institute of North America
8
DataCite
8
Springer Nature (via Crossref)
8
MDPI Open Access Publishing
7
Oxford University Press (via Crossref)
7
Wiley Online Library (via Crossref)
7
HighWire Press (Stanford University)
6
University of North Texas: UNT Digital Library
6
Canadian Science Publishing
5
University of Nebraska-Lincoln: DigitalCommons@UNL
5
Utah State University: DigitalCommons@USU
5
Cambridge University Press
4
Canadian Science Publishing (via Crossref)
4
JSTOR (via Crossref)
4
Northumbria University, Newcastle: Northumbria Research Link (NRL)
4
University of Michigan: Digital Collections
4
University of Nevada, Reno: ScholarWorks Repository
4
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3
BioMed Central
3
Copernicus Publications: E-Journals
3
Digital Collections of Colorado (Colorado State University)
3
Jultika - University of Oulu repository
3
Mountain Scholar (Digital Collections of Colorado and Wyoming)
3
NASA Technical Reports Server (NTRS)
3
RePEc (Research Papers in Economics)
3
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
3
ScienceDirect (Elsevier - via Crossref)
3
The University of Queensland: UQ eSpace
3
University of Michigan: Deep Blue
3
University of Washington, Seattle: ResearchWorks
3
CyberLeninka (Scientific Electronic Library)
2
DSpace@MIT (Massachusetts Institute of Technology)
2
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
2
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