Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
109,879
Directory of Open Access Journals: DOAJ Articles
51,801
PANGAEA - Data Publisher for Earth & Environmental Science
25,868
Unknown
16,790
Arctic Data Center (via DataONE)
12,762
Springer Nature (via Crossref)
6,594
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
6,545
Zenodo
5,847
ScienceDirect (Elsevier - via Crossref)
5,299
Informa (via Crossref)
5,274
University of Calgary Journal Hosting
4,983
Arctic Institute of North America (via Crossref)
4,411
PubMed Central (PMC)
3,864
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3,859
Cambridge University Press
3,732
Defense Technical Information Center: DTIC Technical Reports database
3,556
Copernicus Publications: E-Journals
3,550
Open Parks Network
3,531
LeibnizOpen (The Leibniz Association)
3,272
Wiley Online Library (via Crossref)
3,127
David Rumsey Historical Map Collection (Cartography Associates)
2,675
Springer Nature
2,633
Wiley Online Library
2,621
University of Tromsø: Munin Open Research Archive
2,600
Aarhus University: Research
2,498
Niedersächsisches Online-Archiv NOA
2,413
Arctic Council Repository
2,328
Université de Nantes: HAL-UNIV-NANTES
2,254
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
2,067
MDPI Open Access Publishing
1,990
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1,934
Biodiversity Heritage Library (BHL)
1,769
CyberLeninka (Scientific Electronic Library)
1,746
Informa
1,737
NOAA NCEI Environmental Data Archive (via DataONE)
1,701
Institut national des sciences de l'Univers: HAL-INSU
1,685
ScienceDirect (Elsevier)
1,639
University of Copenhagen: Research
1,538
LaCRIS - University of Lapland Current Research System
1,510
Canadian Science Publishing (via Crossref)
1,446
Dryad Digital Repository (Duke University)
1,382
RePEc (Research Papers in Economics)
1,325
JSTOR (via Crossref)
1,281
University of California: eScholarship
1,226
Frontiers: Figshare
1,196
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,194
University of Michigan: Digital Collections
1,182
Oxford University Press (via Crossref)
1,172
Natural Environment Research Council: NERC Open Research Archive
1,117
University of Alaska: ScholarWorks@UA
1,085
more ...