Content Provider
WikiBooks - Open-content textbooks
290
UNESDOC - UNESCO Digital Library
133
Biodiversity Heritage Library (BHL)
115
norden (Nordic Council of Ministers): Publications (DiVA)
113
Unknown
105
OECD iLibrary (via Crossref)
62
Cambridge University Press
53
University of Southampton: e-Prints Soton
38
RePEc (Research Papers in Economics)
31
Aarhus University: Research
29
University of Copenhagen: Research
26
Oxford University Press (via Crossref)
23
Springer Nature
22
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
20
Open Research Library
18
Technical University of Denmark: DTU Orbit
18
Arctic Portal Library
16
University of the Highlands and Islands: Research Database of UHI
13
De Gruyter
12
Skemman (Iceland)
12
Aalborg University's Research Portal
11
Brill
11
JSTOR
11
Springer Nature (via Crossref)
11
Université de Nantes: HAL-UNIV-NANTES
11
VTT's Research Information Portal
11
Oxford University Press
10
Uppsala University: Publications (DiVA)
10
Lund University Publications (LUP)
9
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
9
Opin vísindi (Iceland)
9
Roskilde University Research Portal (RUC)
9
GEO-LEOe-docs (FID GEO)
8
UQAM - Université du Québec à Montréal: archipel
8
University of Southern Denmark Research Portal
8
DataCite Metadata Store (German National Library of Science and Technology)
7
The London School of Economics and Political Science: LSE Research Online
7
Zenodo
7
BIROn - Birkbeck Institutional Research Online (Birkbeck University of London)
6
David Rumsey Historical Map Collection (Cartography Associates)
6
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
6
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
6
White Rose Research Online (Universities of Leeds, Sheffield & York)
6
European University Institute, Italy: Cadmus (EUI Research Repository)
5
GDZ - Center for Retrospective Digitization, Göttingen (Georg-August-Universität Götingen)
5
Informa (via Crossref)
5
VU Research Repository
5
IFIP Open Digital Library (International Federation for Information Processing)
4
Informa
4
Kiel University Library: Digital Collections
4
more ...