Content Provider
Unknown
40
norden (Nordic Council of Ministers): Publications (DiVA)
38
Directory of Open Access Journals: DOAJ Articles
37
DataCite Metadata Store (German National Library of Science and Technology)
34
Arctic Council Repository
28
Aarhus University: Research
20
LeibnizOpen (The Leibniz Association)
19
University of Copenhagen: Research
17
PubMed Central (PMC)
16
University of Tromsø: Munin Open Research Archive
14
WikiBooks - Open-content textbooks
14
Defense Technical Information Center: DTIC Technical Reports database
13
Institute for Marine Research: Brage IMR
12
Skemman (Iceland)
10
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
10
University of Bergen: Bergen Open Research Archive (BORA-UiB)
10
CDC Stacks (Centers for Disease Control and Prevention)
9
Cambridge University Press
9
UNESDOC - UNESCO Digital Library
8
Wiley Online Library
8
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
7
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
6
CMRE Open Library (NATO STO Centre for Maritime Research and Experimentation
6
Digital.CSIC (Spanish National Research Council)
6
HighWire Press (Stanford University)
6
Opin vísindi (Iceland)
6
University of St Andrews: Research Portal
6
BioOne Online Journals
5
HELDA – University of Helsinki Open Repository
5
University of Southern Denmark Research Portal
5
Arctic Portal Library
4
Instituto Español de Oceanografía: e-IEO
4
Magnolia press
4
North Dakota State University (NDSU): Digital Horizons
4
Umeå University: Publications (DiVA)
4
University of Calgary Journal Hosting
4
Université de Nantes: HAL-UNIV-NANTES
4
Cambridge University Press (via Crossref)
3
Canadian Science Publishing (via Crossref)
3
Copernicus Publications: E-Journals
3
Hathi Trust Digital Library
3
Høgskulen på Vestlandet: HVL Open
3
Institut national des sciences de l'Univers: HAL-INSU
3
Jultika - University of Oulu repository
3
Lund University Publications (LUP)
3
Natural Environment Research Council: NERC Open Research Archive
3
Nofima Knowledge Archive (Brage)
3
Open archive Nord universitet
3
Roskilde University Research Portal (RUC)
3
SAGE Publications
3
more ...