Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
63
Washington State University: WSU Libraries Digital Collections
33
Knowledge Network for Biocomplexity (via DataONE)
28
Arctic Data Center (via DataONE)
18
University of Washington, Seattle: Digital Collections
14
WikiBooks - Open-content textbooks
8
NOAA NCEI Environmental Data Archive (via DataONE)
6
University of Alaska: ScholarWorks@UA
6
Zenodo
6
Unknown
5
University of Calgary Journal Hosting
3
Defense Technical Information Center: DTIC Technical Reports database
2
Informa (via Crossref)
2
North Dakota State University (NDSU): Digital Horizons
2
PubMed Central (PMC)
2
Arctic Institute of North America (via Crossref)
1
Cambridge University Press
1
CyberLeninka (Scientific Electronic Library)
1
Digital Collections of Colorado (Colorado State University)
1
Directory of Open Access Journals: DOAJ Articles
1
Dryad Digital Repository (Duke University)
1
LaCRIS - University of Lapland Current Research System
1
Mountain Scholar (Digital Collections of Colorado and Wyoming)
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
The Gateway to Oklahoma History (University of North Texas Libraries)
1
The University of Queensland: UQ eSpace
1
University of Lethbridge Digitized Collections
1
University of Michigan: Digital Collections
1
University of Missouri: MOspace
1
University of North Carolina: UNC Digital Collections
1
University of North Texas: UNT Digital Library
1
University of the Pacific, McGeorge School of Law: Scholarly Commons
1
University of the Pacific: Scholarly Commons
1
the Digital Archaeological Record (via DataONE)
1