Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
160
da|ra - Registration agency for social and economic data
72
Directory of Open Access Journals: DOAJ Articles
54
Biodiversity Heritage Library (BHL)
40
Unknown
37
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
26
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
19
German Aerospace Center: elib - DLR electronic library
12
GEO-LEOe-docs (FID GEO)
11
UNESDOC - UNESCO Digital Library
11
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
10
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
9
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
8
Digital Repository of Scientific Institutes (RCIN)
7
Georg-August-Universität Göttingen: GOEDOC
5
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
5
AMAD - "Archivum Medii Aevi Digitale - Specialized open access repository for research in the middle ages"
4
Center for Jewish History: Digital Collections
4
TU Wien: reposiTUm
4
University of Freiburg: FreiDok
4
University of Iceland: Peer Reviewed Journals
4
AMUR - Adam Mickiewicz University Repository, Poznan
3
Eberhard Karls University Tübingen: Publication System
3
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
3
Graz University (UGR): Unipub
3
MACAU: Open Access Repository of Kiel University
3
Max Planck Society: MPG.PuRe
3
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
3
Project Gutenberg (PG)
3
University of Luxembourg: ORBilu - Open Repository and Bibliography
3
Adam Mickiewicz University in Poznań: PRESSto
2
Georg-August-Universität Göttingen: eDiss
2
Hathi Trust Digital Library
2
Informa (via Crossref)
2
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
2
MOnAMi - Publication Server of the University of Applied Sciences Mittweida
2
Opin vísindi (Iceland)
2
Publication Server of Goethe University Frankfurt am Main
2
TU Braunschweig: LeoPARD - Publications And Research Data
2
Thieme (via Crossref)
2
University Scientific Journals University of Gdansk (UGN)
2
University of Copenhagen: Research
2
University of Innsbruck: Digital Library (Universitäts- und Landesbibliothek Tirol)
2
epub.oeaw (The digital publication portal of the Austrian Academy of Sciences)
2
pedocs document server (German Education Portal/DIPF)
2
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
1
BOP Serials (Bern Open Publishing, University of Bern)
1
BORIS (Bern Open Repository and Information System, University of Bern)
1
Budrich Journals
1
Cologne University: KUPS
1
more ...