Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
113,740
Directory of Open Access Journals: DOAJ Articles
51,886
PANGAEA - Data Publisher for Earth & Environmental Science
28,300
Unknown
16,893
Arctic Data Center (via DataONE)
12,762
Springer Nature (via Crossref)
6,596
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
6,565
Zenodo
5,890
ScienceDirect (Elsevier - via Crossref)
5,299
Informa (via Crossref)
5,154
University of Calgary Journal Hosting
4,983
Arctic Institute of North America (via Crossref)
4,321
Cambridge University Press
3,961
PubMed Central (PMC)
3,890
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3,861
Wiley Online Library
3,657
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)
3,095
University of Tromsø: Munin Open Research Archive
2,706
David Rumsey Historical Map Collection (Cartography Associates)
2,687
Springer Nature
2,633
Aarhus University: Research
2,537
Niedersächsisches Online-Archiv NOA
2,430
Arctic Council Repository
2,328
Université de Nantes: HAL-UNIV-NANTES
2,274
Institut national des sciences de l'Univers: HAL-INSU
2,222
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
2,069
MDPI Open Access Publishing
1,996
Informa
1,965
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1,934
Biodiversity Heritage Library (BHL)
1,770
CyberLeninka (Scientific Electronic Library)
1,746
NOAA NCEI Environmental Data Archive (via DataONE)
1,701
University of Copenhagen: Research
1,686
ScienceDirect (Elsevier)
1,639
LaCRIS - University of Lapland Current Research System
1,548
Canadian Science Publishing (via Crossref)
1,391
Dryad Digital Repository (Duke University)
1,382
RePEc (Research Papers in Economics)
1,326
JSTOR (via Crossref)
1,273
University of California: eScholarship
1,242
Frontiers: Figshare
1,199
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,194
University of Michigan: Digital Collections
1,182
HAL Sorbonne Université
1,140
Oxford University Press (via Crossref)
1,130
Natural Environment Research Council: NERC Open Research Archive
1,120
more ...