Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
930
the clark - Digital Collections (Sterling and Francine Clark Art Institute Library)
46
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
34
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
27
Frankfurt/Main University Library: Digitale Sammlungen
18
Hathi Trust Digital Library
18
University of Michigan: Digital Collections
17
Norsk Polarinstitutt: Brage NP
14
Norwegian Polar Institute: Brage NP
14
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
13
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
13
Springer Nature (via Crossref)
13
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
12
Biodiversity Heritage Library (BHL)
10
Zenodo
9
Directory of Open Access Journals: DOAJ Articles
8
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
7
Staatsbibliothek zu Berlin: Digitised Collections
5
Unknown
5
WikiBooks - Open-content textbooks
5
GEO-LEOe-docs (FID GEO)
4
OpenAgrar (OA)
4
Publication Server of Goethe University Frankfurt am Main
4
BORIS (Bern Open Repository and Information System, University of Bern)
3
DataCite
3
Georg-August-Universität Göttingen: GOEDOC
3
University of Potsdam: publish.UP
3
WDB - Wolfenbüttel Digital Library (HAB - Herzog-August-Bibliothek Wolfenbüttel)
3
DIAL@USL-B (Université Saint-Louis, Bruxelles)
2
Digital Repository of Scientific Institutes (RCIN)
2
Max Planck Society: MPG.PuRe
2
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
2
TUHH Open Research (TORE - Technische Universität Hamburg)
2
UFZ - Publication Index (Helmholtz-Centre for Environmental Research)
2
ULB Düsseldorf: Digitale Sammlungen (University Library of Düsseldorf University)
2
University of Freiburg: FreiDok
2
Wiley Online Library
2
e-rara.ch (ETH Zürich)
2
Bern University of Applied Sciences: ARBOR
1
Contributions to Entomology = Beiträge zur Entomologie (E-Journal)
1
DBGPrints-Archive (German Soil Science Society)
1
DGS - Deutsche Gesellschaft für Soziologie - Open Access-Publikationen der Deutschen Gesellschaft für Soziologie
1
DiPP NRW (Digital Peer Publishing North-Rhine Westphalia)
1
Doria (National Library of Finland)
1
Duncker & Humblot eLibrary
1
Eberhard Karls University Tübingen: Publication System
1
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
1
German Aerospace Center: elib - DLR electronic library
1
Heidelberg University: HeiDok
1
Kujawsko-Pomorska Digital Library (Nicolaus Copernicus University Torun) / Kujawsko-Pomorska Biblioteka Cyfrowa
1
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