Content Provider
Directory of Open Access Journals: DOAJ Articles
7,928
ScienceDirect (Elsevier - via Crossref)
5,068
Cambridge University Press
3,425
DataCite Metadata Store (German National Library of Science and Technology)
1,721
Wiley Online Library (via Crossref)
1,135
Informa (via Crossref)
1,071
ScienceDirect (Elsevier)
1,038
Wiley Online Library
1,009
Open Parks Network
634
Lund University Publications (LUP)
580
Geological Society of London: Figshare
386
Defense Technical Information Center: DTIC Technical Reports database
372
Informa
347
eCite UTAS (University of Tasmania)
342
Springer Nature (via Crossref)
339
Biodiversity Heritage Library (BHL)
307
University of California: eScholarship
264
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
261
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
225
University of Chicago Press (via Crossref)
219
Research Data Australia (Australian National Data Service - ANDS)
177
David Rumsey Historical Map Collection (Cartography Associates)
161
Unknown
147
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
139
University of California Press (via Crossref)
125
University of California Press
114
OhioLINK: Electronic Theses and Dissertations Center
109
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
104
Hathi Trust Digital Library
102
Columbia University: Academic Commons
99
Uppsala University: Publications (DiVA)
97
University of Leicester: Leicester Research Archive (LRA)
92
University of North Texas: UNT Digital Library
87
LuleƄ University of Technology Publications (DiVA)
86
University of Chicago Press
86
University of Nebraska-Lincoln: DigitalCommons@UNL
85
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
83
USGS Science Data Catalog (via DataONE)
77
PRISM - University of Calgary Digital Repository
76
University of Leicester: Figshare
69
Imperial College London: Spiral
68
Portland State University: PDXScholar
67
University of Michigan: Digital Collections
67
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences)
62
Ohio University Library Digital Archives
53
Rice University: Digital Scholarship Archive
53
University of Massachusetts: ScholarWorks@UMass Amherst
52
The University of Western Ontario: Scholarship@Western
50
University College London: UCL Discovery
48
University of Alaska: ScholarWorks@UA
45
more ...