Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
26
Unknown
12
Borealis
8
PANGAEA - Data Publisher for Earth & Environmental Science
8
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
6
Copernicus Publications: E-Journals
6
Directory of Open Access Journals: DOAJ Articles
5
Niedersächsisches Online-Archiv NOA
4
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
3
Zenodo
3
Northumbria University, Newcastle: Northumbria Research Link (NRL)
2
Defense Technical Information Center: DTIC Technical Reports database
1
MDPI Open Access Publishing
1
Natural Environment Research Council: NERC Open Research Archive
1
Theses Canada/Thèses Canada (Library and Archives Canada)
1
University of Guelph: DSpace digital archive
1
Université de Montréal (UdeM): Papyrus
1