Content Provider
Biodiversity Heritage Library (BHL)
349
Aarhus University: Research
250
University of Copenhagen: Research
185
WikiBooks - Open-content textbooks
157
Technical University of Denmark: DTU Orbit
151
Unknown
61
norden (Nordic Council of Ministers): Publications (DiVA)
52
Cambridge University Press
47
Aalborg University's Research Portal
45
OpenAgrar (OA)
26
RePEc (Research Papers in Economics)
24
University of Southern Denmark Research Portal
24
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
20
Roskilde University Research Portal (RUC)
20
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
19
David Rumsey Historical Map Collection (Cartography Associates)
17
UNESDOC - UNESCO Digital Library
17
University of Southampton: e-Prints Soton
16
American Museum of Natural History: AMNH scientific publications
12
Arctic Portal Library
12
Open Research Library
12
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
10
Oxford University Press (via Crossref)
10
Uppsala University: Publications (DiVA)
10
Informa (via Crossref)
8
DataCite Metadata Store (German National Library of Science and Technology)
7
Kiel University Library: Digital Collections
7
De Gruyter
6
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
5
Architecture, Design and Conservation - Danish Portal for Artistic and Scientific Research: Research Outputs
5
Brill
5
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis)
5
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository)
5
Oxford University Press
5
Springer Nature
5
University of the Highlands and Islands: Research Database of UHI
5
Université de Nantes: HAL-UNIV-NANTES
5
CEDA document repository (Centre for Environmental Data Analysis)
4
Falmouth University Research Repository (FURR)
4
GEO-LEOe-docs (FID GEO)
4
Marine Institute Open Access Repository
4
OECD iLibrary (via Crossref)
4
Texas A&M University Digital Repository
4
USRA Houston Repository (Universities Space Research Association)
4
ETH Zürich Research Collection
3
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
3
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
3
LaCRIS - University of Lapland Current Research System
3
Repozytorium Uniwersytetu w Białymstoku (RUB)
3
SSOAR - Social Science Open Access Repository
3
more ...