Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
228
Zenodo
96
University of Michigan: Digital Collections
46
Doria (National Library of Finland)
19
Unknown
11
WikiBooks - Open-content textbooks
10
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca)
9
Uppsala University: Publications (DiVA)
8
David Rumsey Historical Map Collection (Cartography Associates)
7
Directory of Open Access Journals: DOAJ Articles
7
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
6
Federation of Finnish Learned Societies: Scientific Journals Online
5
Hathi Trust Digital Library
5
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System)
5
The Linnean Society of London: Linnean Collections
5
e-rara.ch (ETH Zürich)
5
Theseus.fi (Open Repository of the Universities of Applied Sciences)
4
CyberLeninka (Scientific Electronic Library)
3
Digitale Sammlungen der Herzogin Anna Amalia Bibliothek Weimar (HAAB)
3
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
3
OpenEdition
3
University of Tartu: ojs.utlib.ee
3
University of Vienna: Phaidra
3
Biodiversity Heritage Library (BHL)
2
Digital Repository of Scientific Institutes (RCIN)
2
JSTOR (via Crossref)
2
Linnaeus University Kalmar Växjö: Publications (DiVA)
2
NORA (National aggregator of open repositories of Russian universities)
2
Tver State University Repository
2
Umeå University: Publications (DiVA)
2
University of Tromsø: Munin Open Research Archive
2
Università degli studi della Tuscia: Unitus DSpace
2
Aalto University Publication Archive (Aaltodoc)
1
Aix-Marseille Université: HAL
1
Amsterdam University Press (AUP)
1
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Badische Landesbibliothek (BLB): Digital Collections
1
Biblioteca Virtual del Patrimonio Bibliográfico
1
Canadian Science Publishing (via Crossref)
1
DataverseNO
1
Digital Library of University of Wroclaw
1
Digital Library of Wielkopolska
1
Duke University Press (via Crossref)
1
Galiciana: Biblioteca Dixital de Galicia (Digital Library of Galicia)
1
Glasgow School of Art: RADAR
1
HELDA – University of Helsinki Open Repository
1
Hungarian Electronic Library (MEK)
1
IRIS Università degli Studi di Napoli Federico II
1
Jultika - University of Oulu repository
1
LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library)
1
more ...