Content Provider
Directory of Open Access Journals: DOAJ Articles
7,776
ScienceDirect (Elsevier - via Crossref)
3,807
Cambridge University Press
3,093
ScienceDirect (Elsevier)
2,022
Wiley Online Library (via Crossref)
1,017
Wiley Online Library
953
Informa (via Crossref)
930
Open Parks Network
634
Lund University Publications (LUP)
578
Defense Technical Information Center: DTIC Technical Reports database
372
eCite UTAS (University of Tasmania)
342
Springer Nature (via Crossref)
337
Informa
271
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
261
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
222
University of Chicago Press (via Crossref)
209
Biodiversity Heritage Library (BHL)
180
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
139
DataCite Metadata Store (German National Library of Science and Technology)
131
OhioLINK: Electronic Theses and Dissertations Center
109
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
108
University of California Press (via Crossref)
108
Columbia University: Academic Commons
99
Uppsala University: Publications (DiVA)
97
Hathi Trust Digital Library
96
University of Leicester: Leicester Research Archive (LRA)
92
University of North Texas: UNT Digital Library
87
Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences)
83
Luleå University of Technology Publications (DiVA)
83
University of California Press
82
PRISM - University of Calgary Digital Repository
76
University of Chicago Press
68
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences)
62
University of California: eScholarship
59
University of Michigan: Digital Collections
54
Rice University: Digital Scholarship Archive
53
Theses Canada/Thèses Canada (Library and Archives Canada)
42
University of Calgary Journal Hosting
39
University College London: UCL Discovery
38
Stockholm University: Publications (DiVA)
37
The College of Wooster: Open Works
37
University of Copenhagen: Research
37
Imperial College London: Spiral
36
Schweizerbart Science Publishers (via Crossref)
36
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
34
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository
31
Swedish Museum of Natural History: Publications (DiVA)
31
The University of Western Ontario: Scholarship@Western
31
The University of Adelaide: Digital Library
30
DIAL@USL-B (Université Saint-Louis, Bruxelles)
28
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