Content Provider
Cambridge University Press
1,102
Directory of Open Access Journals: DOAJ Articles
946
ScienceDirect (Elsevier - via Crossref)
365
DataCite Metadata Store (German National Library of Science and Technology)
293
eCite UTAS (University of Tasmania)
119
ScienceDirect (Elsevier)
62
Defense Technical Information Center: DTIC Technical Reports database
61
Ohio University Library Digital Archives
53
Wiley Online Library (via Crossref)
50
Informa (via Crossref)
44
Geological Society of London: Figshare
39
University of California: eScholarship
39
Wiley Online Library
33
Lund University Publications (LUP)
31
Springer Nature (via Crossref)
30
Biodiversity Heritage Library (BHL)
25
Imperial College London: Spiral
25
Rice University: Digital Scholarship Archive
24
Portland State University: PDXScholar
22
Unknown
20
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
17
University of Chicago Press (via Crossref)
16
Columbia University: Academic Commons
15
Texas Tech University: TTU DSpace Repository
12
Central Washington University: ScholarWorks
11
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
11
Research Data Australia (Australian National Data Service - ANDS)
11
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
10
Montclair State University Digital Commons
10
OhioLINK: Electronic Theses and Dissertations Center
9
University of California Press (via Crossref)
9
University of Michigan: Digital Collections
9
De Gruyter (via Crossref)
8
Digital Commons University of South Florida (USF)
7
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository
7
Sciendo (de Gruyter - via CrossRef)
7
The University of Queensland: UQ eSpace
7
University of Calgary Journal Hosting
7
University of South Florida St. Petersburg: Digital USFSP
7
LSU Digital Commons (Louisiana State University)
6
Northern Illinois University (NIU): Huskie Commons Repository
6
Schweizerbart Science Publishers (via Crossref)
6
DRO - Deakin Research Online
5
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
5
IOP Publishing (via Crossref)
5
The University of Maine: DigitalCommons@UMaine
5
UNESDOC - UNESCO Digital Library
5
University College London: UCL Discovery
5
University of Colorado, Boulder: CU Scholar
5
University of Leicester: Leicester Research Archive (LRA)
5
more ...