Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2,362
Arctic Data Center (via DataONE)
852
NOAA NCEI Environmental Data Archive (via DataONE)
656
Unknown
155
USGS Science Data Catalog (via DataONE)
127
Directory of Open Access Journals: DOAJ Articles
113
University of Calgary Journal Hosting
93
Research Workspace (via DataONE)
84
Defense Technical Information Center: DTIC Technical Reports database
63
Zenodo
54
PANGAEA - Data Publisher for Earth & Environmental Science
42
University of Alaska: ScholarWorks@UA
41
Xiamen University Institutional Repository
39
Wiley Online Library
37
Arctic Institute of North America
35
PubMed Central (PMC)
35
Washington State University: WSU Libraries Digital Collections
29
NASA Technical Reports Server (NTRS)
26
Copernicus Publications: E-Journals
23
University of Washington, Seattle: Digital Collections
23
Knowledge Network for Biocomplexity (via DataONE)
21
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
20
MDPI Open Access Publishing
20
Cambridge University Press
18
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
18
Springer Nature (via Crossref)
18
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
17
Frontiers: Figshare
16
Arctic Portal Library
15
Niedersächsisches Online-Archiv NOA
14
ScienceDirect (Elsevier - via Crossref)
14
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
13
Naval Postgraduate School: Calhoun
13
Frontiers (Publisher)
12
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
11
Canadian Science Publishing (via Crossref)
11
Clark University: Clark Digital Commons
11
HighWire Press (Stanford University)
11
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
11
University of Nebraska-Lincoln: DigitalCommons@UNL
11
Hathi Trust Digital Library
10
Oxford University Press (via Crossref)
10
University of California: eScholarship
10
National Institute of Polar Research Repository, Japan
9
Arctic Council Repository
8
CyberLeninka (Scientific Electronic Library)
8
Université de Nantes: HAL-UNIV-NANTES
8
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
8
Natural Environment Research Council: NERC Open Research Archive
7
Old Dominion University: ODU Digital Commons
7
more ...