Content Provider
Wageningen UR (University & Research Centre): Digital Library
241
University of Groningen research database
212
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
209
WikiBooks - Open-content textbooks
174
Unknown
122
Rijksuniversiteit Groningen: University of Groningen Press
89
DataCite Metadata Store (German National Library of Science and Technology)
64
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
51
DANS Data Station Social Sciences and Humanities (Data Archiving and Networked Services)
44
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
44
Directory of Open Access Journals: DOAJ Articles
41
Research Institute Nature and Forest: Research outputs
34
KNAW: Research Explorer (Royal Netherlands Academy of Arts and Sciences)
23
Biodiversity Heritage Library (BHL)
22
Ghent University Academic Bibliography
21
Hathi Trust Digital Library
19
Utrecht University Repository
18
KU Leuven: Lirias
16
Doria (National Library of Finland)
15
NIOZ Repository (Royal Netherlands Institute for Sea Research)
15
Vrije Universiteit Amsterdam (VU): Research Portal
15
Project Gutenberg (PG)
14
Delft University of Technology: Institutional Repository
12
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
12
Biblioteca Virtual de Defensa (BVD - Ministerio de Defensa de España)
11
IRUA - Institutional Repository van de Universiteit Antwerpen
10
University of Michigan: Digital Collections
9
Amsterdam University Press (AUP)
8
DANS Data Station DANS Data Station Archaeology (Data Archiving and Networked Services) (Data Archiving and Networked Services)
8
National Inst. for Public Health and the Environment, Netherlands (RIVM): Webbased Archive of RIVM Publications (WARP)
8
Vrije Universiteit Brussel (VUB): Research Output
7
Aarhus University: Research
4
Document Server@UHasselt (Hasselt University)
4
Harvard University: Harvard Collections
4
The Portal to Texas History (University of North Texas)
4
Eindhoven University of Technology (TU/e): Research Portal
3
GettDigital (Gettysburg College Digital Collections)
3
Royal Netherlands Academy of Arts and Sciences Research Portal (KNAW)
3
Wageningen University & Research Publication System
3
Zenodo
3
e-rara.ch (ETH Zürich)
3
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
2
Biblioteca Virtual del Patrimonio Bibliográfico
2
Bulletin KNOB (Koninklijke Nederlandse Oudheidkundige Bond)
2
Creighton University: Creighton Digital Repository (CDR)
2
DIAL@UCLouvain (Université catholique de Louvain)
2
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
Maastricht University Research Publications
2
OLAC: Open Language Archives Community
2
Tilburg University: Research portal
2
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