Content Provider
Directory of Open Access Journals: DOAJ Articles
651
ScienceDirect (Elsevier - via Crossref)
376
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
126
DataCite Metadata Store (German National Library of Science and Technology)
103
ScienceDirect (Elsevier)
87
Lund University Publications (LUP)
84
Wiley Online Library
82
Wiley Online Library (via Crossref)
73
Cambridge University Press
63
Defense Technical Information Center: DTIC Technical Reports database
51
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
41
University of California: eScholarship
28
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
22
Geological Society of London: Figshare
21
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
20
University College London: UCL Discovery
16
Columbia University: Academic Commons
15
eCite UTAS (University of Tasmania)
15
University of Nebraska-Lincoln: DigitalCommons@UNL
14
Informa (via Crossref)
12
Old Dominion University: ODU Digital Commons
12
Imperial College London: Spiral
10
IOP Publishing
8
University of California Press
8
ARPI - Archivio della Ricerca dell'Università di Pisa
7
University of California Press (via Crossref)
7
University of Chicago Press (via Crossref)
7
Saint Mary's University, Halifax: Institutional Repository
6
The University of Dublin, Trinity College: TARA (Trinity's Access to Research Archive)
6
University of Massachusetts: ScholarWorks@UMass Amherst
6
DRO - Deakin Research Online
5
Dalhousie University: DalSpace Institutional Repository
5
Digital Commons University of South Florida (USF)
5
Digital Repository @ Iowa State University
5
Hathi Trust Digital Library
5
Portland State University: PDXScholar
5
Springer Nature (via Crossref)
5
University of North Texas: UNT Digital Library
5
University of South Florida St. Petersburg: Digital USFSP
5
Unknown
5
Uppsala University: Publications (DiVA)
5
Utrecht University Repository
5
Florida State University Digital Library (FSUDL)
4
Florida State University: DigiNole Commons
4
LSU Digital Commons (Louisiana State University)
4
Loughborough University: Figshare
4
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
4
Queen's University Belfast Research Portal
4
Rice University: Digital Scholarship Archive
4
The University of Queensland: UQ eSpace
4
more ...