Content Provider
University of Michigan: Digital Collections
3,338
DataCite Metadata Store (German National Library of Science and Technology)
1,588
Unknown
613
Canadian Science Publishing (via Crossref)
427
Zenodo
427
Directory of Open Access Journals: DOAJ Articles
362
Biodiversity Heritage Library (BHL)
361
University of Calgary Journal Hosting
319
University of Lethbridge Digitized Collections
282
Theses Canada/Thèses Canada (Library and Archives Canada)
175
Cambridge University Press
156
ScienceDirect (Elsevier - via Crossref)
145
PubMed Central (PMC)
143
SFU Digitized Collections (Simon Fraser University)
130
Arctic Institute of North America (via Crossref)
126
University of Alberta: Era - Education and Research Archive
119
Arctic Data Center (via DataONE)
115
USGS Science Data Catalog (via DataONE)
111
PRISM - University of Calgary Digital Repository
106
University of British Columbia: cIRcle - UBC's Information Repository
104
Wiley Online Library (via Crossref)
103
Informa (via Crossref)
95
Wiley Online Library
91
Springer Nature (via Crossref)
85
Canadian Science Publishing
84
RePEc (Research Papers in Economics)
82
PANGAEA - Data Publisher for Earth & Environmental Science
73
OLAC: Open Language Archives Community
64
MSpace at the University of Manitoba
61
University of Saskatchewan: eCommons@USASK
60
uO Research (University of Ottawa - uOttawa)
59
ScienceDirect (Elsevier)
58
McGill University: eScholarship@McGill
55
Borealis
54
University of Waterloo, Canada: Institutional Repository
53
University of Victoria (Canada): UVicDSpace
51
JSTOR (via Crossref)
50
VIURRSpace (Royal Roads University and Vancouver Island University)
50
Wilfrid Laurier University, Ontario: Scholars Commons@Laurier
50
CURVE - Carleton University Research Virtual Environment
49
Carleton University's Institutional Repository
49
University of Toronto: Research Repository T-Space
49
Érudit.org (Université Montréal)
48
Defense Technical Information Center: DTIC Technical Reports database
45
Dryad Digital Repository (Duke University)
44
Hathi Trust Digital Library
44
APS Digital Library (American Philosophical Society)
43
Cambridge University Press (via Crossref)
43
MDPI Open Access Publishing
41
WikiBooks - Open-content textbooks
41
more ...