Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
44
NOAA NCEI Environmental Data Archive (via DataONE)
42
Directory of Open Access Journals: DOAJ Articles
41
Defense Technical Information Center: DTIC Technical Reports database
31
Unknown
24
University of Lethbridge Digitized Collections
22
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
19
North Dakota State University (NDSU): Digital Horizons
17
Washington State University: WSU Libraries Digital Collections
13
University of the Pacific, McGeorge School of Law: Scholarly Commons
10
University of the Pacific: Scholarly Commons
10
Stephen F. Austin State University, Texas: Scholar Works @ SFA
7
Wiley Online Library
7
California State University (CSU): DSpace
6
RePEc (Research Papers in Economics)
6
University of Calgary Journal Hosting
6
Leodis - a photographic archive of Leeds (Leeds Library and Information Service)
5
NIOZ Dataverse (Royal Netherlands Institute for Sea Research)
5
Naval Postgraduate School: Calhoun
5
PubMed Central (PMC)
5
Research Data Australia (Australian National Data Service - ANDS)
5
Skemman (Iceland)
5
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
5
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
4
Cambridge University Press
4
David Rumsey Historical Map Collection (Cartography Associates)
4
Frontiers: Figshare
4
MDPI Open Access Publishing
4
NTNU Open Archive (Norwegian University of Science and Technology)
4
National Research Council Canada: NRC Publications Archive
4
ScholarsArchive@OSU (Oregon State University)
4
University of Tromsø: Munin Open Research Archive
4
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3
Charles University CU Digital repository
3
Hunter Library Digital Collections (Western Carolina University)
3
Karlstad University: Publications (DIVA)
3
Max Planck Society: MPG.PuRe
3
Memorial University of Newfoundland: Research Repository
3
OpenEdition
3
The University of Utah: J. Willard Marriott Digital Library
3
University of California: eScholarship
3
University of Maine, School of Law: Digital Commons
3
University of St Andrews: Research Portal
3
University of Victoria (Canada): UVicDSpace
3
Wiley Online Library (via Crossref)
3
Zenodo
3
Arctic Review on Law and Politics
2
Brill (via Crossref)
2
CyberLeninka (Scientific Electronic Library)
2
Delft University of Technology: Institutional Repository
2
more ...