Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
68,343
Directory of Open Access Journals: DOAJ Articles
55,594
Unknown
15,799
Arctic Data Center (via DataONE)
12,766
PANGAEA - Data Publisher for Earth & Environmental Science
8,371
Springer Nature (via Crossref)
5,846
ScienceDirect (Elsevier - via Crossref)
4,049
PubMed Central (PMC)
3,938
Wiley Online Library
3,875
DataCite
3,629
Defense Technical Information Center: DTIC Technical Reports database
3,556
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3,537
Open Parks Network
3,531
Copernicus Publications: E-Journals
3,491
LeibnizOpen (The Leibniz Association)
3,106
Cambridge University Press
2,491
Arctic Council Repository
2,346
University of Tromsø: Munin Open Research Archive
2,312
Niedersächsisches Online-Archiv NOA
2,221
University of Calgary Journal Hosting
2,120
Université de Nantes: HAL-UNIV-NANTES
2,060
Zenodo
2,012
MDPI Open Access Publishing
1,993
Aarhus University: Research
1,941
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1,932
CyberLeninka (Scientific Electronic Library)
1,746
Informa (via Crossref)
1,736
NOAA NCEI Environmental Data Archive (via DataONE)
1,701
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1,654
David Rumsey Historical Map Collection (Cartography Associates)
1,513
Dryad Digital Repository (Duke University)
1,382
Institut national des sciences de l'Univers: HAL-INSU
1,361
RePEc (Research Papers in Economics)
1,326
ScienceDirect (Elsevier)
1,303
Hathi Trust Digital Library
1,243
IOP Publishing
1,224
University of Copenhagen: Research
1,194
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,188
University of Michigan: Digital Collections
1,161
Springer Nature
1,139
Natural Environment Research Council: NERC Open Research Archive
1,074
NASA Technical Reports Server (NTRS)
1,047
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1,043
University of California: eScholarship
1,041
LaCRIS - University of Lapland Current Research System
1,003
Informa
998
Frontiers: Figshare
977
University of Alaska: ScholarWorks@UA
931
Arctic Institute of North America
899
Canadian Science Publishing (via Crossref)
871
more ...