Content Provider
University of Michigan: Digital Collections
860
DataCite Metadata Store (German National Library of Science and Technology)
249
University of Lethbridge Digitized Collections
141
Connecticut Digital Archive
122
Unknown
110
North Dakota State University (NDSU): Digital Horizons
86
Zenodo
81
Directory of Open Access Journals: DOAJ Articles
70
University of Calgary Journal Hosting
61
PANGAEA - Data Publisher for Earth & Environmental Science
59
MSpace at the University of Manitoba
45
NOAA NCEI Environmental Data Archive (via DataONE)
43
Canadian Science Publishing (via Crossref)
38
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
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
24
ScienceDirect (Elsevier - via Crossref)
22
Biodiversity Heritage Library (BHL)
21
PubMed Central (PMC)
20
David Rumsey Historical Map Collection (Cartography Associates)
19
University of Toronto: Research Repository T-Space
17
Copernicus Publications: E-Journals
16
University of Washington, Seattle: Digital Collections
15
Informa (via Crossref)
14
Université de Nantes: HAL-UNIV-NANTES
14
Niedersächsisches Online-Archiv NOA
12
The Portal to Texas History (University of North Texas)
12
UQAM - Université du Québec à Montréal: archipel
11
Érudit.org (Université Montréal)
11
HighWire Press (Stanford University)
10
Washington State University: WSU Libraries Digital Collections
10
WikiBooks - Open-content textbooks
10
Wiley Online Library (via Crossref)
10
Arctic Institute of North America (via Crossref)
9
Canadian Science Publishing
9
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
Hathi Trust Digital Library
8
Institut national de la recherche scientifique, Québec: Espace INRS
8
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
8
The Canadian Field-Naturalist (E-Journal)
8
University of Nebraska-Lincoln: DigitalCommons@UNL
8
University of Saskatchewan: eCommons@USASK
8
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