Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,627
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
816
Directory of Open Access Journals: DOAJ Articles
773
Frankfurt/Main University Library: Digitale Sammlungen
710
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
510
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
506
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
442
Springer Nature (via Crossref)
410
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
362
Unknown
354
Biodiversity Heritage Library (BHL)
334
WikiBooks - Open-content textbooks
307
LeibnizOpen (The Leibniz Association)
222
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
209
OpenAgrar (OA)
207
German Aerospace Center: elib - DLR electronic library
199
University of Freiburg: FreiDok
190
University of Michigan: Digital Collections
187
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
170
Publication Server of Goethe University Frankfurt am Main
139
Hathi Trust Digital Library
123
GEO-LEOe-docs (FID GEO)
122
University of Vienna: Phaidra
101
Max Planck Society: MPG.PuRe
96
Georg-August-Universität Göttingen: GOEDOC
88
da|ra - Registration agency for social and economic data
88
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
83
e-rara.ch (ETH Zürich)
75
Digital Repository of Scientific Institutes (RCIN)
68
KITopen (Karlsruhe Institute of Technologie)
61
BORIS (Bern Open Repository and Information System, University of Bern)
55
University of Potsdam: publish.UP
55
Doria (National Library of Finland)
53
the clark - Digital Collections (Sterling and Francine Clark Art Institute Library)
49
Thieme (via Crossref)
48
Wiley Online Library
46
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
45
Federation of Finnish Learned Societies: Scientific Journals Online
42
Staatsbibliothek zu Berlin: Digitised Collections
42
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
41
Norsk Polarinstitutt: Brage NP
39
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
39
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
38
Zenodo
38
Norwegian Polar Institute: Brage NP
37
EconStor (German National Library of Economics, ZBW)
36
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
36
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
34
RWTH Aachen University: RWTH Publications
34
Cologne University: KUPS
33
more ...