Content Provider
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Apollo - University of Cambridge Repository
53
University of Southampton: e-Prints Soton
53
University of British Columbia: cIRcle - UBC's Information Repository
51
Georgetown University: DigitalGeorgetown
49
Johns Hopkins University Press
49
University of the Highlands and Islands: Research Database of UHI
48
BioMed Central
47
Project Gutenberg (PG)
47
The Portal to Texas History (University of North Texas)
47
JSTOR (via Crossref)
44
MSpace at the University of Manitoba
44
Aarhus University: Research
43
Copernicus Publications: E-Journals
43
VIURRSpace (Royal Roads University and Vancouver Island University)
42
PRISM - University of Calgary Digital Repository
41
University of Toronto: Research Repository T-Space
41
York University Digital Library
40
eCite UTAS (University of Tasmania)
39
University of Chicago Press (via Crossref)
37
Arca (BC's Digital Treasures)
36
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
36
ORA - Oxford University Research Archive
34
Magnolia press
31
The Library of Congress: American Memory
31
University of Cambridge, Department of Earth Sciences: ESC Publications
31
University of Waterloo, Canada: Institutional Repository
31
uO Research (University of Ottawa - uOttawa)
31
Athabasca University Digitization Portal
30
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
30
HAL Sorbonne Université
30
The Canadian Field-Naturalist (E-Journal)
30
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
30
University of Copenhagen: Research
29
Alces (A Journal Devoted to the Biology and Management of Moose)
27
Brock University Digital Repository
27
Niedersächsisches Online-Archiv NOA
26
PLOS
26
University of Guelph: DSpace digital archive
26
University of Toronto Press (U Toronto Press)
26
Instituto Español de Oceanografía: e-IEO
25
Spectrum: Concordia University Research Repository (Montreal)
25
AAAS Resource Center (American Association for the Advancement of Science)
24
Institute for Marine Research: Brage IMR
24
Ovid (via Crossref)
24
University of Bristol: Bristol Research
24
Université de Bretagne Occidentale: HAL
24
Pensoft Publishers
23
The Royal Society
22
University of Tasmania: UTas ePrints
22
Johns Hopkins University Press (via Crossref)
21
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