Content Provider
DataCite
3,496
DataCite Metadata Store (German National Library of Science and Technology)
3,490
Zenodo
1,806
NOAA NCEI Environmental Data Archive (via DataONE)
325
USGS Science Data Catalog (via DataONE)
258
Arctic Data Center (via DataONE)
214
University of Calgary Journal Hosting
100
Unknown
98
Research Workspace (via DataONE)
89
Defense Technical Information Center: DTIC Technical Reports database
72
University of Alaska: ScholarWorks@UA
62
Directory of Open Access Journals: DOAJ Articles
36
Wiley Online Library
32
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
25
University of Michigan: Digital Collections
19
Hathi Trust Digital Library
18
Frontiers: Figshare
17
University of North Texas: UNT Digital Library
16
Arctic Institute of North America
15
PubMed Central (PMC)
15
Copernicus Publications: E-Journals
12
Canadian Science Publishing
11
NASA Technical Reports Server (NTRS)
10
Niedersächsisches Online-Archiv NOA
10
PANGAEA - Data Publisher for Earth & Environmental Science
10
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
9
Cambridge University Press
9
WikiBooks - Open-content textbooks
9
University of St Andrews: Research Portal
8
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
8
The University of Texas at Austin: Texas ScholarWorks
7
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
6
Rolling Deck to Repository (R2R) (via DataONE)
6
ScienceDirect (Elsevier)
6
University of California: eScholarship
6
BioOne Online Journals
5
Biodiversity Heritage Library (BHL)
5
ScienceDirect (Elsevier - via Crossref)
5
Texas A&M University - Corpus Christi: DSpace Repository
5
Utah State University: DigitalCommons@USU
5
Wiley Online Library (via Crossref)
5
Canadian Science Publishing (via Crossref)
4
David Rumsey Historical Map Collection (Cartography Associates)
4
Dryad Digital Repository (Duke University)
4
Frontiers (Publisher)
4
HighWire Press (Stanford University)
4
MDPI Open Access Publishing
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
RePEc (Research Papers in Economics)
4
University of St Andrews: Digital Research Repository
4
more ...