Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
62
Norsk Polarinstitutt: Brage NP
29
Norwegian Polar Institute: Brage NP
28
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
12
German Aerospace Center: elib - DLR electronic library
9
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
6
Directory of Open Access Journals: DOAJ Articles
5
Biodiversity Heritage Library (BHL)
4
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
4
WikiBooks - Open-content textbooks
3
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
2
Digital Repository of Scientific Institutes (RCIN)
2
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
2
OpenAgrar (OA)
2
RWTH Aachen University: RWTH Publications
2
Unknown
2
Zenodo
2
BORIS (Bern Open Repository and Information System, University of Bern)
1
Bayreuth University: EPub Bayreuth
1
Cologne University: KUPS
1
Digital Library Thüringen
1
Frankfurt/Main University Library: Digitale Sammlungen
1
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
1
JKI Open Journal Systems (Julius Kühn-Institut)
1
Martin-Luther-Universität Halle-Wittenberg - Universitäts- und Landesbibliothek Sachsen-Anhalt (E-Journal)
1
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
1
Project Gutenberg (PG)
1
Publication Server of Goethe University Frankfurt am Main
1
Publikationsdatenbank der Fraunhofer-Gesellschaft
1
UFZ - Publication Index (Helmholtz-Centre for Environmental Research)
1
Umeå University: Publications (DiVA)
1
University of Groningen research database
1
University of St Andrews: Research Portal
1
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca)
1
e-rara.ch (ETH Zürich)
1