Content Provider
WikiBooks - Open-content textbooks
149
David Rumsey Historical Map Collection (Cartography Associates)
64
KITopen (Karlsruhe Institute of Technologie)
9
USRA Houston Repository (Universities Space Research Association)
9
Cambridge University Press
8
Unknown
8
University of Copenhagen: Research
4
DataCite Metadata Store (German National Library of Science and Technology)
2
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
2
Texas A&M University Digital Repository
2
Aisberg - Archivio istituzionale dell'Università di Bergamo
1
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
1
Biodiversity Heritage Library (BHL)
1
CEDA document repository (Centre for Environmental Data Analysis)
1
Cardiff University: ORCA (Online Research @ Cardiff)
1
City University of New York: CUNY Academic Works
1
De Gruyter
1
Goldsmiths University of London: Goldsmiths Research Online
1
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis)
1
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository)
1
Indiana University: Digital Library of the Commons (DLC)
1
JSTOR
1
James Cook University, Australia: ResearchOnline@JCU
1
Monash Collections Online
1
National Museums Scotland (NMS) Research Repository
1
Open Research Library
1
Springer Nature
1
Springer Nature (via Crossref)
1
Technical University of Denmark: DTU Orbit
1
The Catholic University of America: Digital Collections
1
Umeå University: Publications (DiVA)
1
Universidade Federal do Paraná (UFPR): Teses & Dissertações
1
University of Minnesota Press
1
University of Otago: OUR Heritage (Otage University Research)
1
University of Southampton: e-Prints Soton
1
University of Tasmania: UTas ePrints
1
e-rara.ch (ETH Zürich)
1