Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
25
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
20
Digital Repository of Scientific Institutes (RCIN)
17
Harvard University: Harvard Collections
7
Hathi Trust Digital Library
5
University of Michigan: Digital Collections
5
Project Gutenberg (PG)
4
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
3
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
3
York University Digital Library
3
German Aerospace Center: elib - DLR electronic library
2
Bayreuth University: EPub Bayreuth
1
Cologne University: KUPS
1
Georg-August-Universität Göttingen: GOEDOC
1
Villanova University Falvey Memorial Library: Villanova Digital Library
1