Content Provider
Copernicus Publications: E-Journals
38
Unknown
14
PubMed Central (PMC)
6
MDPI Open Access Publishing
5
DataCite Metadata Store (German National Library of Science and Technology)
2
eCite UTAS (University of Tasmania)
2
Defense Technical Information Center: DTIC Technical Reports database
1
Digital Collections of Colorado (Colorado State University)
1
Mountain Scholar (Digital Collections of Colorado and Wyoming)
1
Natural Environment Research Council: NERC Open Research Archive
1
Research Data Unipd (Università degli Studi die Padova)
1