Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
63
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
7
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
6
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
5
The Portal to Texas History (University of North Texas)
5
WikiBooks - Open-content textbooks
5
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
4
University of Michigan: Digital Collections
4
Unknown
4
Digital Repository of Scientific Institutes (RCIN)
3
OpenAgrar (OA)
3
Biodiversity Heritage Library (BHL)
2
Directory of Open Access Journals: DOAJ Articles
2
GettDigital (Gettysburg College Digital Collections)
2
OPUS - Publication Server of the University of Stuttgart
2
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
2
The Catholic University of America: Digital Collections
2
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
2
epub.oeaw (The digital publication portal of the Austrian Academy of Sciences)
2
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
Biologie in unserer Zeit (BiuZ - E-Journal)
1
Böhlau Verlag (via Crossref)
1
Contributions to Entomology = Beiträge zur Entomologie (E-Journal)
1
DIAL@USL-B (Université Saint-Louis, Bruxelles)
1
Eberhard Karls University Tübingen: Publication System
1
EconStor (German National Library of Economics, ZBW)
1
GEO-LEOe-docs (FID GEO)
1
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
1
Heidelberg University: HeiDok
1
Informa (via Crossref)
1
OPARU (OPen Access Repository of Ulm University)
1
REPOSIT HAW Hamburg
1
The Library of Congress: American Memory
1
UQAM - Université du Québec à Montréal: archipel
1
University of Tartu: Dspace
1
University of Vienna: Phaidra
1
University of Washington, Seattle: Digital Collections
1
Wiley Online Library (via Crossref)
1
ePLUS - Open Access Publikationsserver der Universität Salzburg
1