Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
10
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
4
Staatsbibliothek zu Berlin: Digitised Collections
4
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
3
Digital Repository of Scientific Institutes (RCIN)
3
Publication Server of Goethe University Frankfurt am Main
3
WikiBooks - Open-content textbooks
3
GEO-LEOe-docs (FID GEO)
2
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
2
Biologie in unserer Zeit (BiuZ - E-Journal)
1
Doria (National Library of Finland)
1
Free University of Bozen-Bolzano (UNIBZ): BIA (Bozen-Bolzano Institutional Archive)
1
Hathi Trust Digital Library
1
Justus-Liebig-Universität Giessen: JLUpub
1
Max Planck Society: MPG.PuRe
1
North Dakota State University (NDSU): Digital Horizons
1
OpenAgrar (OA)
1
Prokla - Journal of Critical Social Science
1
Publication Server of the FH Aachen University of Applied Sciences
1
Publication Server of the Justus-Liebig-University of Giessen
1
Robert Koch Institute: Publications
1
Universidad Autónoma de Madrid (UAM): Biblos-e Archivo
1
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
1
University of Michigan: Digital Collections
1
Universität Leipzig: Qucosa
1