Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2,563
Arctic Data Center (via DataONE)
368
Defense Technical Information Center: DTIC Technical Reports database
214
Unknown
171
University of Alaska: ScholarWorks@UA
129
Directory of Open Access Journals: DOAJ Articles
121
University of Calgary Journal Hosting
89
PANGAEA - Data Publisher for Earth & Environmental Science
63
Copernicus Publications: E-Journals
55
NASA Technical Reports Server (NTRS)
43
Niedersächsisches Online-Archiv NOA
43
LeibnizOpen (The Leibniz Association)
39
Wiley Online Library
39
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
38
University of Washington, Seattle: Digital Collections
36
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
34
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
32
PubMed Central (PMC)
32
NOAA NCEI Environmental Data Archive (via DataONE)
30
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
30
Institut national des sciences de l'Univers: HAL-INSU
28
Knowledge Network for Biocomplexity (via DataONE)
26
Zenodo
25
Université de Nantes: HAL-UNIV-NANTES
22
University of California: eScholarship
20
Cambridge University Press
18
International Arctic Research Center (IARC) Data Archive (via DataONE)
16
MDPI Open Access Publishing
16
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
16
Dryad Digital Repository (Duke University)
15
Wiley Online Library (via Crossref)
15
Research Workspace (via DataONE)
14
HAL Sorbonne Université
13
University of North Texas: UNT Digital Library
13
Université Grenoble Alpes: HAL
12
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
11
University of Liège: ORBi (Open Repository and Bibliography)
10
Arctic Institute of North America (via Crossref)
9
DIAL@UCLouvain (Université catholique de Louvain)
9
DIAL@USL-B (Université Saint-Louis, Bruxelles)
9
RePEc (Research Papers in Economics)
9
Archives ouvertes de Paris-Saclay
8
Frontiers: Figshare
8
Naval Postgraduate School: Calhoun
8
ScholarsArchive@OSU (Oregon State University)
8
ScienceDirect (Elsevier - via Crossref)
8
University of Colorado, Boulder: CU Scholar
8
University of Tromsø: Munin Open Research Archive
8
University of Washington, Seattle: ResearchWorks
8
Chalmers University of Technology: Chalmers research
7
more ...