Content Provider
University of Groningen research database
40
Unknown
32
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
30
Rijksuniversiteit Groningen: University of Groningen Press
20
WikiBooks - Open-content textbooks
15
DataCite Metadata Store (German National Library of Science and Technology)
11
Wageningen UR (University & Research Centre): Digital Library
9
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
5
Directory of Open Access Journals: DOAJ Articles
3
Utrecht University Repository
3
Biodiversity Heritage Library (BHL)
2
DANS Data Station Social Sciences and Humanities (Data Archiving and Networked Services)
2
Delft University of Technology: Institutional Repository
2
Vrije Universiteit Brussel (VUB): Research Output
2
Bulletin KNOB (Koninklijke Nederlandse Oudheidkundige Bond)
1
Center for Jewish History: Digital Collections
1
Eindhoven University of Technology (TU/e): Research Portal
1
Hathi Trust Digital Library
1
KNAW: Research Explorer (Royal Netherlands Academy of Arts and Sciences)
1
National Inst. for Public Health and the Environment, Netherlands (RIVM): Webbased Archive of RIVM Publications (WARP)
1
Project Gutenberg (PG)
1
The Portal to Texas History (University of North Texas)
1
Tilburg University: Research portal
1
University of Miami: Digital Collections
1