Content Provider
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
122
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
3
Center for Jewish History: Digital Collections
2
DataCite Metadata Store (German National Library of Science and Technology)
1
Publication Server of Goethe University Frankfurt am Main
1