Content Provider
WikiBooks - Open-content textbooks
12
University of Copenhagen: Research
8
Technical University of Denmark: DTU Orbit
6
USRA Houston Repository (Universities Space Research Association)
6
Unknown
6
Arctic Portal Library
4
UNESDOC - UNESCO Digital Library
4
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
3
Cambridge University Press
2
OpenAgrar (OA)
2
University of St Andrews: Digital Research Repository
2
Aarhus University: Research
1
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
1
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
British Museum Research Repository
1
DIAL@UCLouvain (Université catholique de Louvain)
1
DIAL@USL-B (Université Saint-Louis, Bruxelles)
1
FIRe! - Publikationsserver des FIZBw (Fachinformationszentrum der Bundeswehr)
1
GEO-LEOe-docs (FID GEO)
1
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
1
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
1
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
1
National Research Council Canada: NRC Publications Archive
1
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1
Oxford University Press
1
Oxford University Press (via Crossref)
1
Salem State University: Digital Commons
1
Texas A&M University Galveston Campus: DSpace Repository
1
University of Liège: ORBi (Open Repository and Bibliography)
1
University of North Texas: UNT Digital Library
1
University of Sussex: Figshare
1
University of Sussex: Sussex Research Online
1
Université Grenoble Alpes: HAL
1
Université de Nantes: HAL-UNIV-NANTES
1
VTT's Research Information Portal
1
Vrije Universiteit Amsterdam (VU): Research Portal
1
transcript Verlag
1