Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
4,034
NOAA NCEI Environmental Data Archive (via DataONE)
1,658
Arctic Data Center (via DataONE)
962
Unknown
913
PANGAEA - Data Publisher for Earth & Environmental Science
680
Directory of Open Access Journals: DOAJ Articles
400
ScienceDirect (Elsevier - via Crossref)
326
USGS Science Data Catalog (via DataONE)
296
University of Washington, Seattle: Digital Collections
276
Hathi Trust Digital Library
259
CyberLeninka (Scientific Electronic Library)
236
ScienceDirect (Elsevier)
204
University of Michigan: Digital Collections
203
Springer Nature (via Crossref)
186
University of Alaska: ScholarWorks@UA
170
Defense Technical Information Center: DTIC Technical Reports database
164
Research Workspace (via DataONE)
159
Washington State University: WSU Libraries Digital Collections
143
Wiley Online Library
140
PubMed Central (PMC)
124
University of California: eScholarship
124
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications
123
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
122
HighWire Press (Stanford University)
120
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
116
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons
112
University of Calgary Journal Hosting
92
Knowledge Network for Biocomplexity (via DataONE)
82
NASA Technical Reports Server (NTRS)
66
Santa Clara University: SCU Digital Collections
63
Wiley Online Library (via Crossref)
57
Canadian Science Publishing (via Crossref)
55
Xiamen University Institutional Repository
55
Frontiers: Figshare
53
MDPI Open Access Publishing
51
Cambridge University Press
49
Copernicus Publications: E-Journals
49
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
47
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
46
RePEc (Research Papers in Economics)
45
Oxford University Press (via Crossref)
42
University of Washington, Seattle: ResearchWorks
42
National Institute of Polar Research Repository, Japan
40
Open Parks Network
40
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
39
DataCite
38
Canadian Science Publishing
37
Dryad Digital Repository (Duke University)
37
Niedersächsisches Online-Archiv NOA
37
Informa (via Crossref)
32
more ...