Content Provider
Arctic Data Center (via DataONE)
45
University of Alaska: ScholarWorks@UA
17
DataCite Metadata Store (German National Library of Science and Technology)
16
University of Washington, Seattle: Digital Collections
3
Unknown
3
Washington State University: WSU Libraries Digital Collections
3
Defense Technical Information Center: DTIC Technical Reports database
2
North Dakota State University (NDSU): Digital Horizons
2
Oxford University Press (via Crossref)
2
University of Calgary Journal Hosting
2
University of Florida: Digital Library Center
2
Zenodo
2
Cambridge University Press
1
Canadian Science Publishing
1
Hunter Library Digital Collections (Western Carolina University)
1
Natural Environment Research Council: NERC Open Research Archive
1
PANGAEA - Data Publisher for Earth & Environmental Science
1
PubMed Central (PMC)
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
University of Lethbridge Digitized Collections
1
University of North Texas: UNT Digital Library
1
University of Wisconsin: Digital Collections
1
University of the Pacific, McGeorge School of Law: Scholarly Commons
1
University of the Pacific: Scholarly Commons
1