Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
749
DataCite Metadata Store (German National Library of Science and Technology)
35
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
7
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
4
Directory of Open Access Journals: DOAJ Articles
3
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
3
Center for Jewish History: Digital Collections
2
Hathi Trust Digital Library
2
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
1
Biodiversity Heritage Library (BHL)
1
Frankfurt/Main University Library: Digitale Sammlungen
1
GEO-LEOe-docs (FID GEO)
1
HELDA – University of Helsinki Open Repository
1
Informa (via Crossref)
1
The Library of Congress: American Memory
1
University of Freiburg: FreiDok
1
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
1
Wisconsin Historical Society: Turning Points in Wisconsin History
1