Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
35
University of Washington, Seattle: Digital Collections
7
Washington State University: WSU Libraries Digital Collections
7
Unknown
6
Zenodo
6
Directory of Open Access Journals: DOAJ Articles
5
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
4
Apollo - University of Cambridge Repository
4
Biodiversity Heritage Library (BHL)
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
3
Cambridge University Press
2
CyberLeninka (Scientific Electronic Library)
2
David Rumsey Historical Map Collection (Cartography Associates)
2
Frontiers: Figshare
2
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository
2
Aarhus University: Research
1
Cambridge University Press (via Crossref)
1
Copernicus Publications: E-Journals
1
Frontiers (Publisher)
1
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
1
LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library)
1
LSRC VL (Lithuanian Social Research Centre Virtual Library)
1
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
1
National Library of Australia: Digital Collections
1
Natural Environment Research Council: NERC Open Research Archive
1
Niedersächsisches Online-Archiv NOA
1
Northumbria University, Newcastle: Northumbria Research Link (NRL)
1
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
1
PANGAEA - Data Publisher for Earth & Environmental Science
1
Peking University Institutional Repository (PKU IR)
1
Portland State University: PDXScholar
1
PubMed Central (PMC)
1
Queen's University Belfast Research Portal
1
Springer Nature (via Crossref)
1
The University of Liverpool Repository
1
University of Calgary Journal Hosting
1
University of California Press (via Crossref)
1
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
1
University of Miami: Digital Collections
1
University of Potsdam: publish.UP
1
White Rose Research Online (Universities of Leeds, Sheffield & York)
1
White Rose eTheses Online (Universities Leeds, Sheffield, York)
1
Wiley Online Library
1