Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,275
Unknown
63
Directory of Open Access Journals: DOAJ Articles
45
David Rumsey Historical Map Collection (Cartography Associates)
43
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
32
Arctic Data Center (via DataONE)
31
Zenodo
28
Copernicus Publications: E-Journals
25
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
19
Niedersächsisches Online-Archiv NOA
17
Cambridge University Press
16
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
15
Wiley Online Library
14
Wiley Online Library (via Crossref)
14
University of Copenhagen: Research
13
Institut national des sciences de l'Univers: HAL-INSU
12
Lund University Publications (LUP)
12
University of Calgary Journal Hosting
12
HAL Sorbonne Université
10
PubMed Central (PMC)
10
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ
10
Defense Technical Information Center: DTIC Technical Reports database
9
NOAA NCEI Environmental Data Archive (via DataONE)
9
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
8
Université de Nantes: HAL-UNIV-NANTES
8
Aarhus University: Research
7
PANGAEA - Data Publisher for Earth & Environmental Science
7
École Polytechnique, Université Paris-Saclay: HAL
6
École des Ponts ParisTech: HAL
6
BioOne Online Journals
5
Cambridge University Press (via Crossref)
5
Macquarie University Research Portal
5
NORA (National aggregator of open repositories of Russian universities)
5
Stockholm University: Publications (DiVA)
5
University of Groningen research database
5
Uppsala University: Publications (DiVA)
5
Washington State University: WSU Libraries Digital Collections
5
Curtin University: espace
4
CyberLeninka (Scientific Electronic Library)
4
Kazan Federal University Digital Repository
4
Magnolia press
4
Oxford University Press (via Crossref)
4
Technical University of Denmark: DTU Orbit
4
The Czech Academy of Sciences: Publication Activity (ASEP)
4
University of Greenwich: Greenwich Academic Literature Archive
4
Wageningen UR (University & Research Centre): Digital Library
4
Apollo - University of Cambridge Repository
3
ArXiv.org (Cornell University Library)
3
BORIS (Bern Open Repository and Information System, University of Bern)
3
Canadian Science Publishing (via Crossref)
3
more ...