Content Provider
Cambridge University Press
1
Copernicus Publications: E-Journals
1
DataCite Metadata Store (German National Library of Science and Technology)
81
Defense Technical Information Center: DTIC Technical Reports database
2
Directory of Open Access Journals: DOAJ Articles
4
MDPI Open Access Publishing
2
NASA Technical Reports Server (NTRS)
3
NOAA NCEI Environmental Data Archive (via DataONE)
76
Natural Environment Research Council: NERC Open Research Archive
1
Niedersächsisches Online-Archiv NOA
1
PubMed Central (PMC)
1
University of Calgary Journal Hosting
3
University of Southampton: e-Prints Soton
1
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1
Unknown
1
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
1