Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
4
PANGAEA - Data Publisher for Earth & Environmental Science
3
University of Groningen research database
2
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Cambridge University Press
1
David Rumsey Historical Map Collection (Cartography Associates)
1
Directory of Open Access Journals: DOAJ Articles
1
ENEA-IRIS Open Archive (Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile)
1
Journals at the University of Arizona
1
MDPI Open Access Publishing
1
Natural Environment Research Council: NERC Open Research Archive
1
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
1
University of California: eScholarship
1
University of Washington, Seattle: ResearchWorks
1
Unknown
1