Content Provider
Directory of Open Access Journals: DOAJ Articles
8,486
ScienceDirect (Elsevier - via Crossref)
3,830
ScienceDirect (Elsevier)
2,035
Cambridge University Press
1,856
DataCite Metadata Store (German National Library of Science and Technology)
1,727
DataCite
1,216
Informa (via Crossref)
720
Open Parks Network
634
Lund University Publications (LUP)
583
Geological Society of London: Figshare
389
Defense Technical Information Center: DTIC Technical Reports database
372
eCite UTAS (University of Tasmania)
342
Springer Nature (via Crossref)
339
Biodiversity Heritage Library (BHL)
308
University of California: eScholarship
283
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
265
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
231
Research Data Australia (Australian National Data Service - ANDS)
200
David Rumsey Historical Map Collection (Cartography Associates)
162
University of Chicago Press (via Crossref)
159
Unknown
147
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
139
Hathi Trust Digital Library
127
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
123
Informa
114
OhioLINK: Electronic Theses and Dissertations Center
109
Uppsala University: Publications (DiVA)
101
Columbia University: Academic Commons
99
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
92
University of Leicester: Leicester Research Archive (LRA)
92
LuleƄ University of Technology Publications (DiVA)
87
University of North Texas: UNT Digital Library
87
University of Nebraska-Lincoln: DigitalCommons@UNL
86
PRISM - University of Calgary Digital Repository
77
USGS Science Data Catalog (via DataONE)
77
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)
66
Wiley Online Library (via Crossref)
66
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
Wiley Online Library
50
University College London: UCL Discovery
48
University of Alaska: ScholarWorks@UA
45
University of South Florida St. Petersburg: Digital USFSP
45
The College of Wooster: Open Works
44
more ...