Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,249
NOAA NCEI Environmental Data Archive (via DataONE)
643
Arctic Data Center (via DataONE)
331
Research Workspace (via DataONE)
79
Unknown
34
Directory of Open Access Journals: DOAJ Articles
29
Xiamen University Institutional Repository
26
Defense Technical Information Center: DTIC Technical Reports database
21
PANGAEA - Data Publisher for Earth & Environmental Science
19
USGS Science Data Catalog (via DataONE)
17
University of Calgary Journal Hosting
13
Zenodo
13
ScienceDirect (Elsevier - via Crossref)
11
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
10
Arctic Portal Library
10
Copernicus Publications: E-Journals
10
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
10
NASA Technical Reports Server (NTRS)
8
Springer Nature (via Crossref)
8
Hathi Trust Digital Library
7
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
7
Niedersächsisches Online-Archiv NOA
7
Old Dominion University: ODU Digital Commons
7
University of Washington, Seattle: Digital Collections
6
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
5
Biodiversity Heritage Library (BHL)
5
Frontiers (Publisher)
5
International Arctic Research Center (IARC) Data Archive (via DataONE)
5
PubMed Central (PMC)
5
University of Alaska: ScholarWorks@UA
5
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
5
Frontiers: Figshare
4
HighWire Press (Stanford University)
4
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
4
MDPI Open Access Publishing
4
Pohang University of Science and Technology (POSTECH): Open Access System for Information Sharing (OASIS)
4
Research Center for Eco-Environmental Sciences: RCEES OpenIR (Chinese Academy of Sciences)
4
The Hong Kong University of Science and Technology: HKUST Institutional Repository
4
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
4
Harvard University: Harvard Collections
3
Hereon Publications (Helmholtz-Zentrum)
3
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
3
Magnolia press
3
National Institute of Polar Research Repository, Japan
3
Natural Environment Research Council: NERC Open Research Archive
3
Naval Postgraduate School: Calhoun
3
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
3
Springer Nature
3
University of Nebraska-Lincoln: DigitalCommons@UNL
3
University of New Hampshire: Scholars Repository
3
more ...