Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
257
USGS Science Data Catalog (via DataONE)
28
Unknown
21
Directory of Open Access Journals: DOAJ Articles
17
Frontiers: Figshare
17
University of Alaska: ScholarWorks@UA
14
NOAA NCEI Environmental Data Archive (via DataONE)
12
PANGAEA - Data Publisher for Earth & Environmental Science
11
Research Workspace (via DataONE)
9
Copernicus Publications: E-Journals
7
RePEc (Research Papers in Economics)
5
Arctic Data Center (via DataONE)
4
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
4
University of California: eScholarship
4
Frontiers (Publisher)
3
Niedersächsisches Online-Archiv NOA
3
PubMed Central (PMC)
3
Wiley Online Library (via Crossref)
3
Zenodo
3
HighWire Press (Stanford University)
2
Oxford University Press
2
ScholarsArchive@OSU (Oregon State University)
2
Springer Nature (via Crossref)
2
University of Victoria (Canada): UVicDSpace
2
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
2
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
MDPI Open Access Publishing
1
PLOS
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
ScienceDirect (Elsevier - via Crossref)
1
Texas A&M University - Corpus Christi: DSpace Repository
1
Texas A&M University Digital Repository
1
The University of Maine: DigitalCommons@UMaine
1
Universidade do Algarve: Sapienta
1
University of Montana: ScholarWorks
1
University of Nebraska-Lincoln: DigitalCommons@UNL
1
University of Toronto: Research Repository T-Space
1
University of Washington, Seattle: ResearchWorks
1
VTechWorks (VirginiaTech)
1
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
1
Wiley Online Library
1
Wilfrid Laurier University, Ontario: Scholars Commons@Laurier
1