Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
15
Biodiversity Heritage Library (BHL)
4
The University of Utah: J. Willard Marriott Digital Library
4
Directory of Open Access Journals: DOAJ Articles
3
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
2
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
2
York University Digital Library
2
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
1
Augsburg University Publication Server (OPUS)
1
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
1
German Aerospace Center: elib - DLR electronic library
1
Maine State Documents (Maine State Library)
1
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
1
North Dakota State University (NDSU): Digital Horizons
1
OpenAgrar (OA)
1
Princeton Theological Seminary: Theological Commons
1
Publication Server of Goethe University Frankfurt am Main
1
The Portal to Texas History (University of North Texas)
1
University of Michigan: Digital Collections
1
University of Vienna: Phaidra
1
Unknown
1
ZFDM Repository (Center for Sustainable Research Data Management, Hamburg University)
1