Content Provider
University of Michigan: Digital Collections
4,494
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
3,625
DataCite Metadata Store (German National Library of Science and Technology)
3,598
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,383
Memorial University of Newfoundland: Research Repository
712
David Rumsey Historical Map Collection (Cartography Associates)
576
Unknown
540
Zenodo
417
Directory of Open Access Journals: DOAJ Articles
336
PubMed Central (PMC)
227
Borealis
203
Canadian Science Publishing (via Crossref)
174
Biodiversity Heritage Library (BHL)
158
Hathi Trust Digital Library
134
RePEc (Research Papers in Economics)
112
University of Lethbridge Digitized Collections
96
WikiBooks - Open-content textbooks
86
Cambridge University Press
83
Springer Nature (via Crossref)
82
University of New Brunswick: Centre for Digital Scholarship Journals
71
ScienceDirect (Elsevier - via Crossref)
69
HighWire Press (Stanford University)
68
Érudit.org (Université Montréal)
66
Dryad Digital Repository (Duke University)
59
Cambridge University Press (via Crossref)
58
MDPI Open Access Publishing
55
University of Toronto: Research Repository T-Space
55
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
53
Theses Canada/Thèses Canada (Library and Archives Canada)
48
Canadian Science Publishing
47
Dalhousie University: DalSpace Institutional Repository
47
SAGE Publications (via Crossref)
44
Oxford University Press (via Crossref)
42
The Portal to Texas History (University of North Texas)
42
York University Digital Library
38
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
37
University of Calgary Journal Hosting
37
University of Washington, Seattle: Digital Collections
37
Arca (BC's Digital Treasures)
36
National Research Council Canada: NRC Publications Archive
36
Wiley Online Library (via Crossref)
36
Saint Mary's University, Halifax: Institutional Repository
35
Apollo - University of Cambridge Repository
33
Informa (via Crossref)
33
BioOne Online Journals
31
Defense Technical Information Center: DTIC Technical Reports database
31
Athabasca University Digitization Portal
30
Frontiers: Figshare
30
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
30
Schulich Scholars (Schulich School of Law, Dalhousie University)
30
more ...