Content Provider
WikiBooks - Open-content textbooks
234
David Rumsey Historical Map Collection (Cartography Associates)
129
Biodiversity Heritage Library (BHL)
21
Cambridge University Press
10
KITopen (Karlsruhe Institute of Technologie)
10
USRA Houston Repository (Universities Space Research Association)
9
Unknown
8
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
4
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
IIASA DARE (Data Repository of the International Institute of Applied Systems Analysis)
2
IIASA PURE (International Institute of Applied Systems Analysis: PUblications REpository)
2
Oxford University Press
2
Texas A&M University Digital Repository
2
Aisberg - Archivio istituzionale dell'Università di Bergamo
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
Falmouth University Research Repository (FURR)
1
Goldsmiths University of London: Goldsmiths Research Online
1
Indiana University: Digital Library of the Commons (DLC)
1
JSTOR
1
James Cook University, Australia: ResearchOnline@JCU
1
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
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
Vrije Universiteit Amsterdam (VU): Research Portal
1
e-rara.ch (ETH Zürich)
1