Content Provider
Hunter Library Digital Collections (Western Carolina University)
50
DataCite Metadata Store (German National Library of Science and Technology)
16
The University of Utah: J. Willard Marriott Digital Library
15
Unknown
12
PubMed Central (PMC)
4
MDPI Open Access Publishing
3
Saint Louis University Libraries Digital Collections
3
ArXiv.org (Cornell University Library)
2
Copernicus Publications: E-Journals
2
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository
2
The University of Maine: DigitalCommons@UMaine
2
Auburn University Digital Library
1
Boise State University: Scholar Works
1
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
1
HighWire Press (Stanford University)
1
Natural Environment Research Council: NERC Open Research Archive
1
The University of Southern Mississippi: The Aquila Digital Community
1
UTSA Digital Collections (The University of Texas at San Antonio)
1
University of New Hampshire: Scholars Repository
1
University of Tasmania: UTas ePrints
1
University of the Pacific, McGeorge School of Law: Scholarly Commons
1
University of the Pacific: Scholarly Commons
1