Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
350
NOAA NCEI Environmental Data Archive (via DataONE)
35
Defense Technical Information Center: DTIC Technical Reports database
2
PANGAEA - Data Publisher for Earth & Environmental Science
2
Zenodo
2
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1
Copernicus Publications: E-Journals
1
Directory of Open Access Journals: DOAJ Articles
1
MDPI Open Access Publishing
1
Niedersächsisches Online-Archiv NOA
1
OpenAgrar (OA)
1
University of Calgary Journal Hosting
1
Unknown
1