Content Provider
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
5,317
University of Michigan: Digital Collections
4,413
DataCite Metadata Store (German National Library of Science and Technology)
2,525
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
1,374
Memorial University of Newfoundland: Research Repository
1,046
Unknown
374
Directory of Open Access Journals: DOAJ Articles
289
PubMed Central (PMC)
239
Memorial University of Newfoundland: Electronic Journals
120
RePEc (Research Papers in Economics)
96
Hathi Trust Digital Library
92
Canadian Science Publishing (via Crossref)
91
University of New Brunswick: Centre for Digital Scholarship Journals
90
ScienceDirect (Elsevier - via Crossref)
88
Springer Nature (via Crossref)
75
Theses Canada/Thèses Canada (Library and Archives Canada)
75
Wiley Online Library
73
SAGE Publications (via Crossref)
60
Érudit.org (Université Montréal)
58
Cambridge University Press
55
Defense Technical Information Center: DTIC Technical Reports database
53
McGill University: eScholarship@McGill
52
HighWire Press (Stanford University)
49
MDPI Open Access Publishing
43
University of Calgary Journal Hosting
41
Oxford University Press (via Crossref)
38
Saint Mary's University, Halifax: Institutional Repository
38
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
37
The Online Books Page (Penn Libraries, University of Pennsylvania)
37
APS Digital Library (American Philosophical Society)
33
University of Toronto: Research Repository T-Space
33
Five Colleges of Ohio Digital Collections
32
Missouri State University: Digital Collections
32
Queen's University, Ontario: QSpace
32
WikiBooks - Open-content textbooks
29
Canadian Science Publishing
28
SAGE Publications
28
The Portal to Texas History (University of North Texas)
28
Informa (via Crossref)
27
National Research Council Canada: NRC Publications Archive
26
BioMed Central
24
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
23
Arca (BC's Digital Treasures)
22
Dalhousie University: DalSpace Institutional Repository
22
The University of Utah: J. Willard Marriott Digital Library
22
JSTOR (via Crossref)
20
University of British Columbia: cIRcle - UBC's Information Repository
20
LeibnizOpen (The Leibniz Association)
19
Wiley Online Library (via Crossref)
19
uO Research (University of Ottawa - uOttawa)
19
more ...