Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
73,969
Directory of Open Access Journals: DOAJ Articles
57,096
PANGAEA - Data Publisher for Earth & Environmental Science
30,834
Unknown
16,925
Arctic Data Center (via DataONE)
12,766
DataCite
10,488
Springer Nature (via Crossref)
6,596
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
5,625
Zenodo
5,299
University of Calgary Journal Hosting
4,993
Arctic Institute of North America
4,889
Wiley Online Library
4,757
Arctic Council Repository
4,492
ScienceDirect (Elsevier - via Crossref)
4,180
PubMed Central (PMC)
4,068
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3,861
Cambridge University Press
3,618
Copernicus Publications: E-Journals
3,578
Defense Technical Information Center: DTIC Technical Reports database
3,556
Open Parks Network
3,531
Informa (via Crossref)
3,529
LeibnizOpen (The Leibniz Association)
3,394
Informa
3,376
ScienceDirect (Elsevier)
2,859
University of Tromsø: Munin Open Research Archive
2,761
Springer Nature
2,633
Aarhus University: Research
2,573
David Rumsey Historical Map Collection (Cartography Associates)
2,480
Niedersächsisches Online-Archiv NOA
2,309
Université de Nantes: HAL-UNIV-NANTES
2,279
Institut national des sciences de l'Univers: HAL-INSU
2,268
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
2,046
MDPI Open Access Publishing
1,996
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1,937
CyberLeninka (Scientific Electronic Library)
1,746
University of Copenhagen: Research
1,729
Biodiversity Heritage Library (BHL)
1,706
NOAA NCEI Environmental Data Archive (via DataONE)
1,701
LaCRIS - University of Lapland Current Research System
1,586
Dryad Digital Repository (Duke University)
1,382
RePEc (Research Papers in Economics)
1,326
IOP Publishing
1,271
Hathi Trust Digital Library
1,249
Frontiers: Figshare
1,217
University of California: eScholarship
1,216
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,194
University of Michigan: Digital Collections
1,182
Natural Environment Research Council: NERC Open Research Archive
1,131
JSTOR (via Crossref)
1,082
University of Washington, Seattle: Digital Collections
1,071
more ...