Content Provider
University of Michigan: Digital Collections
1,009
DataCite Metadata Store (German National Library of Science and Technology)
524
University of Lethbridge Digitized Collections
217
Unknown
127
Connecticut Digital Archive
122
NOAA NCEI Environmental Data Archive (via DataONE)
107
North Dakota State University (NDSU): Digital Horizons
87
Directory of Open Access Journals: DOAJ Articles
73
University of Calgary Journal Hosting
67
MSpace at the University of Manitoba
46
Wiley Online Library
38
Dryad Digital Repository (Duke University)
35
Theses Canada/Thèses Canada (Library and Archives Canada)
35
York University, Toronto: YorkSpace
33
Arctic Data Center (via DataONE)
32
Springer Nature (via Crossref)
30
Canadian Science Publishing (via Crossref)
29
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
28
ScienceDirect (Elsevier - via Crossref)
27
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
27
Cambridge University Press
24
David Rumsey Historical Map Collection (Cartography Associates)
24
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
23
PubMed Central (PMC)
22
WikiBooks - Open-content textbooks
22
Hathi Trust Digital Library
21
Copernicus Publications: E-Journals
18
University of Toronto: Research Repository T-Space
17
USGS Science Data Catalog (via DataONE)
16
University of Washington, Seattle: Digital Collections
16
Université de Nantes: HAL-UNIV-NANTES
15
University of Nebraska-Lincoln: DigitalCommons@UNL
14
Canadian Science Publishing
13
HighWire Press (Stanford University)
13
Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen)
12
Hunter Library Digital Collections (Western Carolina University)
12
The Portal to Texas History (University of North Texas)
12
Institut national des sciences de l'Univers: HAL-INSU
11
Niedersächsisches Online-Archiv NOA
11
UQAM - Université du Québec à Montréal: archipel
11
University of Saskatchewan: eCommons@USASK
11
Université Laval: CorpusUL
11
Washington State University: WSU Libraries Digital Collections
11
PRISM - University of Calgary Digital Repository
10
ScienceDirect (Elsevier)
10
Institut national de la recherche scientifique, Québec: Espace INRS
9
University of the Pacific, McGeorge School of Law: Scholarly Commons
9
University of the Pacific: Scholarly Commons
9
York University Digital Library
9
Érudit.org (Université Montréal)
9
more ...