Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
54
Unknown
36
North Dakota State University (NDSU): Digital Horizons
31
Frontiers: Figshare
28
Directory of Open Access Journals: DOAJ Articles
25
University of Tromsø: Munin Open Research Archive
24
University of Washington, Seattle: Digital Collections
21
Washington State University: WSU Libraries Digital Collections
21
Open Parks Network
15
University of Alaska: ScholarWorks@UA
14
University of the Highlands and Islands: Research Database of UHI
13
Zenodo
13
Hathi Trust Digital Library
11
University of Alberta: Era - Education and Research Archive
10
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
9
The Royal Society
9
PubMed Central (PMC)
8
Springer Nature (via Crossref)
8
The Royal Society: Figshare
8
Wiley Online Library (via Crossref)
8
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
7
Copernicus Publications: E-Journals
6
Aarhus University: Research
5
HighWire Press (Stanford University)
5
NTNU Open Archive (Norwegian University of Science and Technology)
5
Oxford University Press (via Crossref)
5
Université de Nantes: HAL-UNIV-NANTES
5
Wiley Online Library
5
Doria (National Library of Finland)
4
Dryad Digital Repository (Duke University)
4
Lund University Publications (LUP)
4
NOAA NCEI Environmental Data Archive (via DataONE)
4
National Library of Australia: Digital Collections
4
Niedersächsisches Online-Archiv NOA
4
Open archive Norwegian University of Life Sciences: Brage NMBU
4
Umeå University: Publications (DiVA)
4
Arizona Memory Project (Arizona State Library, Archives and Public Records)
3
Frontiers (Publisher)
3
Institute for Marine Research: Brage IMR
3
JSTOR (via Crossref)
3
Johns Hopkins University Press
3
Luleå University of Technology Publications (DiVA)
3
National Institute of Polar Research Repository, Japan
3
Natural Environment Research Council: NERC Open Research Archive
3
Oxford University Press
3
ScienceDirect (Elsevier - via Crossref)
3
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
3
University of Michigan: Digital Collections
3
University of St Andrews: Research Portal
3
University of Strathclyde Glasgow: Strathprints
3
more ...