Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
724
Zenodo
16
Ghent University Academic Bibliography
5
NOAA NCEI Environmental Data Archive (via DataONE)
4
Cambridge University Press
3
Directory of Open Access Journals: DOAJ Articles
3
SciELO Brazil (Scientific Electronic Library Online)
3
Hathi Trust Digital Library
2
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
1
Natural Environment Research Council: NERC Open Research Archive
1
University of Glasgow: Enlighten - Publications
1
University of Michigan: Digital Collections
1