Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
6,219
PANGAEA - Data Publisher for Earth & Environmental Science
3,695
Directory of Open Access Journals: DOAJ Articles
1,827
Informa (via Crossref)
1,751
Unknown
1,377
Defense Technical Information Center: DTIC Technical Reports database
491
Informa
466
NOAA NCEI Environmental Data Archive (via DataONE)
383
LaCRIS - University of Lapland Current Research System
361
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
331
SAGE Publications (via Crossref)
269
LeibnizOpen (The Leibniz Association)
266
Ohio State University (OSU): Knowledge Bank
254
Zenodo
251
University of Tromsø: Munin Open Research Archive
245
Cambridge University Press
242
Wiley Online Library (via Crossref)
235
Arctic Data Center (via DataONE)
223
University of Nebraska-Lincoln: DigitalCommons@UNL
206
UNESDOC - UNESCO Digital Library
198
Cambridge University Press (via Crossref)
194
Washington State University: WSU Libraries Digital Collections
158
ScienceDirect (Elsevier - via Crossref)
155
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
152
Research Data Australia (Australian National Data Service - ANDS)
146
Oxford University Press (via Crossref)
131
eCite UTAS (University of Tasmania)
127
Brill (via Crossref)
118
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
113
Arctic Portal Library
111
The Royal Society (via Crossref)
110
University of Southern Denmark Research Portal
109
Université de Nantes: HAL-UNIV-NANTES
109
Theseus.fi (Open Repository of the Universities of Applied Sciences)
107
da|ra - Registration agency for social and economic data
99
Wiley Online Library
96
KNAW: Research Explorer (Royal Netherlands Academy of Arts and Sciences)
94
CyberLeninka (Scientific Electronic Library)
91
University of North Texas: UNT Digital Library
85
Springer Nature (via Crossref)
84
SSOAR - Social Science Open Access Repository
82
Umeå University: Publications (DiVA)
80
University of Copenhagen: Research
79
Aarhus University: Research
75
University of Calgary Journal Hosting
74
Skemman (Iceland)
73
HELDA – University of Helsinki Open Repository
72
Open archive Nord universitet
72
Dove Medical Press
70
University of California: eScholarship
67
more ...