Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
110,826
Directory of Open Access Journals: DOAJ Articles
51,162
PANGAEA - Data Publisher for Earth & Environmental Science
18,672
Unknown
15,783
Arctic Data Center (via DataONE)
12,762
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
6,168
Springer Nature (via Crossref)
5,846
Zenodo
5,594
ScienceDirect (Elsevier - via Crossref)
5,167
PubMed Central (PMC)
3,827
Wiley Online Library
3,706
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
Copernicus Publications: E-Journals
3,533
Open Parks Network
3,531
Wiley Online Library (via Crossref)
3,183
LeibnizOpen (The Leibniz Association)
3,065
Cambridge University Press
3,016
Informa (via Crossref)
2,702
David Rumsey Historical Map Collection (Cartography Associates)
2,673
Niedersächsisches Online-Archiv NOA
2,404
University of Tromsø: Munin Open Research Archive
2,286
Arctic Council Repository
2,213
University of Calgary Journal Hosting
2,129
Université de Nantes: HAL-UNIV-NANTES
2,091
Aarhus University: Research
2,090
Institut national des sciences de l'Univers: HAL-INSU
2,012
MDPI Open Access Publishing
1,994
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1,934
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
1,830
Biodiversity Heritage Library (BHL)
1,767
CyberLeninka (Scientific Electronic Library)
1,746
NOAA NCEI Environmental Data Archive (via DataONE)
1,701
ScienceDirect (Elsevier)
1,490
University of Copenhagen: Research
1,446
Canadian Science Publishing (via Crossref)
1,430
Dryad Digital Repository (Duke University)
1,382
RePEc (Research Papers in Economics)
1,326
Frontiers: Figshare
1,193
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,188
LaCRIS - University of Lapland Current Research System
1,166
University of California: eScholarship
1,163
University of Michigan: Digital Collections
1,161
Springer Nature
1,139
Natural Environment Research Council: NERC Open Research Archive
1,068
IOP Publishing (via Crossref)
1,062
Hathi Trust Digital Library
1,056
NASA Technical Reports Server (NTRS)
1,047
University of Alaska: ScholarWorks@UA
1,032
Arctic Institute of North America (via Crossref)
964
more ...