Content Provider
University of Michigan: Digital Collections
860
DataCite Metadata Store (German National Library of Science and Technology)
217
University of Lethbridge Digitized Collections
141
Connecticut Digital Archive
122
Unknown
110
North Dakota State University (NDSU): Digital Horizons
86
Directory of Open Access Journals: DOAJ Articles
68
University of Calgary Journal Hosting
61
MSpace at the University of Manitoba
45
NOAA NCEI Environmental Data Archive (via DataONE)
43
York University, Toronto: YorkSpace
34
Dryad Digital Repository (Duke University)
33
Theses Canada/Thèses Canada (Library and Archives Canada)
32
Arctic Data Center (via DataONE)
31
Wiley Online Library
30
Canadian Science Publishing (via Crossref)
26
Springer Nature (via Crossref)
26
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
25
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
25
Cambridge University Press
23
ScienceDirect (Elsevier - via Crossref)
22
PubMed Central (PMC)
20
University of Toronto: Research Repository T-Space
17
Copernicus Publications: E-Journals
16
Hathi Trust Digital Library
16
University of Washington, Seattle: Digital Collections
15
Université de Nantes: HAL-UNIV-NANTES
14
The Portal to Texas History (University of North Texas)
12
WikiBooks - Open-content textbooks
12
UQAM - Université du Québec à Montréal: archipel
11
Canadian Science Publishing
10
HighWire Press (Stanford University)
10
Niedersächsisches Online-Archiv NOA
10
Washington State University: WSU Libraries Digital Collections
10
Institut national des sciences de l'Univers: HAL-INSU
9
PRISM - University of Calgary Digital Repository
9
ScienceDirect (Elsevier)
9
York University Digital Library
9
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
8
Institut national de la recherche scientifique, Québec: Espace INRS
8
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
8
University of Nebraska-Lincoln: DigitalCommons@UNL
8
University of Saskatchewan: eCommons@USASK
8
Érudit.org (Université Montréal)
8
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
7
Informa (via Crossref)
7
NASA Technical Reports Server (NTRS)
7
The Canadian Field-Naturalist (E-Journal)
7
University of Waterloo, Canada: Institutional Repository
7
Université Laval: CorpusUL
7
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