Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,570
Directory of Open Access Journals: DOAJ Articles
868
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
816
Frankfurt/Main University Library: Digitale Sammlungen
712
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
526
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)
387
WikiBooks - Open-content textbooks
372
Unknown
354
Biodiversity Heritage Library (BHL)
345
DataCite
267
LeibnizOpen (The Leibniz Association)
233
OpenAgrar (OA)
213
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
209
German Aerospace Center: elib - DLR electronic library
199
Hathi Trust Digital Library
199
University of Freiburg: FreiDok
191
University of Michigan: Digital Collections
187
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
170
Zenodo
142
Publication Server of Goethe University Frankfurt am Main
141
GEO-LEOe-docs (FID GEO)
124
University of Vienna: Phaidra
101
Max Planck Society: MPG.PuRe
96
da|ra - Registration agency for social and economic data
91
Georg-August-Universität Göttingen: GOEDOC
88
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
83
Wiley Online Library
81
e-rara.ch (ETH Zürich)
76
BORIS (Bern Open Repository and Information System, University of Bern)
75
Digital Repository of Scientific Institutes (RCIN)
68
KITopen (Karlsruhe Institute of Technologie)
61
University of Potsdam: publish.UP
55
Publication Server of the Justus-Liebig-University of Giessen
54
Thieme
54
Doria (National Library of Finland)
53
the clark - Digital Collections (Sterling and Francine Clark Art Institute Library)
49
Staatsbibliothek zu Berlin: Digitised Collections
48
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
45
Federation of Finnish Learned Societies: Scientific Journals Online
42
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
41
Norsk Polarinstitutt: Brage NP
39
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
39
Universitäts- und Landesbibliothek Sachsen-Anhalt: Bibliotheca Ponickaviana
39
EconStor (German National Library of Economics, ZBW)
38
Norwegian Polar Institute: Brage NP
37
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server
36
RWTH Aachen University: RWTH Publications
36
more ...