Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
157
Zenodo
81
Unknown
46
National Library of Australia: Digital Collections
8
Cambridge University Press
4
University of Leicester: Leicester Research Archive (LRA)
4
University of Washington, Seattle: Digital Collections
4
North Dakota State University (NDSU): Digital Horizons
3
Defense Technical Information Center: DTIC Technical Reports database
2
Directory of Open Access Journals: DOAJ Articles
2
University of Groningen research database
2
York University Digital Library
2
Arctic Institute of North America (via Crossref)
1
DIGIBUG: Repositorio Institucional de la Universidad de Granada
1
David Rumsey Historical Map Collection (Cartography Associates)
1
Dialnet - Portada de revistas (Universidad de La Rioja)
1
Digital.CSIC (Spanish National Research Council)
1
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
1
IEDA: US Antarctic Program Data Center (via DataONE)
1
Journals at the University of Arizona
1
National Institute of Polar Research Repository, Japan
1
Natural Environment Research Council: NERC Open Research Archive
1
OpenEdition
1
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
1
The University of Maine: DigitalCommons@UMaine
1
UND Scholarly Commons (University of North Dakota)
1
Umeå University: Publications (DiVA)
1
Universidad de Oviedo: RUO
1
University of Calgary Journal Hosting
1
University of Tromsø: Munin Open Research Archive
1
University of Tromsø: Septentrio Academic Publishing
1
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1
Washington State University: WSU Libraries Digital Collections
1