Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
157
Unknown
34
Digital.CSIC (Spanish National Research Council)
17
KovsieScholar Repository (University of the Free State - UFS UV)
10
Frontiers: Figshare
9
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
5
GFZ Data Services (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
2
Instituto Español de Oceanografía: e-IEO
1
National Library of Australia: Digital Collections
1
National Research Council Canada: NRC Publications Archive
1
SERPENT Media Archive (Scientific and Environmental ROV Partnership using Existing iNdustrial Technology)
1
University of Washington, Seattle: Digital Collections
1