Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
465
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
84
LeibnizOpen (The Leibniz Association)
83
University of Freiburg: FreiDok
64
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
49
Springer Nature (via Crossref)
41
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
38
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
38
University of Michigan: Digital Collections
28
OpenAgrar (OA)
22
WikiBooks - Open-content textbooks
22
Unknown
21
KITopen (Karlsruhe Institute of Technologie)
18
GEO-LEOe-docs (FID GEO)
16
Wiley Online Library
14
Dresden University of Technology: Qucosa
11
Georg-August-Universität Göttingen: GOEDOC
11
Max Planck Society: MPG.PuRe
11
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
11
Directory of Open Access Journals: DOAJ Articles
9
BORIS (Bern Open Repository and Information System, University of Bern)
8
Biodiversity Heritage Library (BHL)
8
Freie Universität Berlin: Refubium (FU Berlin)
8
German Aerospace Center: elib - DLR electronic library
8
Publication Server of Goethe University Frankfurt am Main
7
Wiley Online Library (via Crossref)
7
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
5
Gutenberg Open Science (Open-Science-Repository of the Johannes Gutenberg-University Mainz)
5
RWTH Aachen University: RWTH Publications
5
Thieme (via Crossref)
5
University of Potsdam: publish.UP
5
Augsburg University Publication Server (OPUS)
4
MACAU: Open Access Repository of Kiel University
4
Münster University (WWU): miami
4
OPUS - Publication Server of the University of Stuttgart
4
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
3
Biologie in unserer Zeit (BiuZ - E-Journal)
3
Duncker & Humblot eLibrary
3
EconStor (German National Library of Economics, ZBW)
3
Georg-August-Universität Göttingen: eDiss
3
Heidelberg University: HeiDok
3
Heinrich Heine University Düsseldorf (HHU) : Document- and Publishingservice
3
Justus-Liebig-Universität Giessen: JLUpub
3
Publication Server of the Justus-Liebig-University of Giessen
3
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
3
University of Vienna: Phaidra
3
mediarep
3
Berufsverband Information Bibliothek (BIB): OPUS
2
Cologne University: KUPS
2
Contributions to Entomology = Beiträge zur Entomologie (E-Journal)
2
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