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Cambridge University Press
102
Directory of Open Access Journals: DOAJ Articles
21
ScienceDirect (Elsevier - via Crossref)
18
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
6
Wiley Online Library (via Crossref)
4
ScienceDirect (Elsevier)
3
Rice University: Digital Scholarship Archive
2
University of California: eScholarship
2
Boston University: OpenBU
1
Dipòsit Digital de la Universitat de Barcelona
1
Imperial College London: Spiral
1
University of Chicago Press (via Crossref)
1
Uppsala University: Publications (DiVA)
1
Wiley Online Library
1