Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
8,573
Arctic Data Center (via DataONE)
1,327
PANGAEA - Data Publisher for Earth & Environmental Science
532
Unknown
478
NOAA NCEI Environmental Data Archive (via DataONE)
397
Directory of Open Access Journals: DOAJ Articles
373
Zenodo
264
ScienceDirect (Elsevier - via Crossref)
219
Defense Technical Information Center: DTIC Technical Reports database
191
Research Workspace (via DataONE)
176
USGS Science Data Catalog (via DataONE)
173
Springer Nature (via Crossref)
127
ScienceDirect (Elsevier)
120
University of Calgary Journal Hosting
107
Wiley Online Library
96
University of Alaska: ScholarWorks@UA
93
PubMed Central (PMC)
89
CyberLeninka (Scientific Electronic Library)
87
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
77
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
73
Copernicus Publications: E-Journals
66
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
62
Frontiers: Figshare
61
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
59
University of Michigan: Digital Collections
57
Xiamen University Institutional Repository
52
MDPI Open Access Publishing
50
National Institute of Polar Research Repository, Japan
50
Niedersächsisches Online-Archiv NOA
48
Wiley Online Library (via Crossref)
46
Cambridge University Press
45
Université de Nantes: HAL-UNIV-NANTES
45
Frontiers (Publisher)
42
Institut national des sciences de l'Univers: HAL-INSU
42
Naval Postgraduate School: Calhoun
42
Biodiversity Heritage Library (BHL)
38
IEDA: Marine-Geo Digital Library (via DataONE)
35
Arctic Institute of North America (via Crossref)
33
Hathi Trust Digital Library
33
Arctic Portal Library
32
Dryad Digital Repository (Duke University)
28
Aarhus University: Research
27
OLAC: Open Language Archives Community
27
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
27
Oxford University Press (via Crossref)
27
HAL Sorbonne Université
26
University of Southampton: e-Prints Soton
26
University of Tromsø: Munin Open Research Archive
26
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
25
NASA Technical Reports Server (NTRS)
24
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