Content Provider
Directory of Open Access Journals: DOAJ Articles
61
Lund University Publications (LUP)
12
Defense Technical Information Center: DTIC Technical Reports database
8
Cambridge University Press
6
ScienceDirect (Elsevier - via Crossref)
6
DataCite Metadata Store (German National Library of Science and Technology)
5
Imperial College London: Spiral
4
University of California: eScholarship
3
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
2
Boston University: OpenBU
1
Columbia University: Academic Commons
1
David Rumsey Historical Map Collection (Cartography Associates)
1
Geological Society of London: Figshare
1
Old Dominion University: ODU Digital Commons
1
Purdue University Graduate School: Figshare
1
Purdue University: e-Pubs
1
Southern Methodist University: SMU Digital Repository
1
Stockholm University: Publications (DiVA)
1
University College London: UCL Discovery
1
University of Colorado, Boulder: CU Scholar
1
University of Minnesota Digital Conservancy
1
University of St Andrews: Digital Research Repository
1
Unknown
1
Utrecht University Repository
1
eCite UTAS (University of Tasmania)
1