Content Provider
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
33
DataCite Metadata Store (German National Library of Science and Technology)
22
Hathi Trust Digital Library
10
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
7
Georg-August-Universität Göttingen: GOEDOC
6
Share it - Open Access und Forschungsdaten-Repositorium der Hochschulbibliotheken in Sachsen-Anhalt
5
e-rara.ch (ETH Zürich)
5
Biodiversity Heritage Library (BHL)
4
Staatsbibliothek zu Berlin: Digitised Collections
4
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
3
Digital Repository of Scientific Institutes (RCIN)
3
GEO-LEOe-docs (FID GEO)
3
Max Planck Society: MPG.PuRe
3
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
2
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository
2
Jagiellonian University: Jagiellonian Digital Library
2
OpenAgrar (OA)
2
Springer Nature (via Crossref)
2
University of Innsbruck: Digital Library (Universitäts- und Landesbibliothek Tirol)
2
BORIS (Bern Open Repository and Information System, University of Bern)
1
Badische Landesbibliothek (BLB): Digital Collections
1
Digital Library of Wielkopolska
1
Directory of Open Access Journals: DOAJ Articles
1
Duncker & Humblot eLibrary
1
Georg-August-Universität Göttingen: eDiss
1
Ghent University Academic Bibliography
1
Harvard University: Harvard Collections
1
Heidelberg University Library: Heidelberg historic literature - digitized
1
HiN (E-Journal)
1
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
1
Lower Silesian Digital Library
1
MACAU: Open Access Repository of Kiel University
1
The Library of Congress: American Memory
1
Thieme (via Crossref)
1
University of Michigan: Digital Collections
1
University of Münster: Digital Collections
1