Content Provider
Unknown
35
DataCite Metadata Store (German National Library of Science and Technology)
29
University of Calgary Journal Hosting
28
Directory of Open Access Journals: DOAJ Articles
23
Canadian Science Publishing (via Crossref)
18
University of Lethbridge Digitized Collections
14
PANGAEA - Data Publisher for Earth & Environmental Science
12
Theses Canada/Thèses Canada (Library and Archives Canada)
12
Cambridge University Press
10
Copernicus Publications: E-Journals
8
Wiley Online Library (via Crossref)
8
Canadian Science Publishing
7
University of Victoria (Canada): UVicDSpace
7
Wiley Online Library
7
Carleton University's Institutional Repository
6
Borealis
5
Niedersächsisches Online-Archiv NOA
5
University of British Columbia: cIRcle - UBC's Information Repository
5
WikiBooks - Open-content textbooks
5
Queen's University, Ontario: QSpace
4
University of Tromsø: Septentrio Academic Publishing
4
University of Waterloo, Canada: Institutional Repository
4
uO Research (University of Ottawa - uOttawa)
4
Biodiversity Heritage Library (BHL)
3
Cambridge University Press (via Crossref)
3
PRISM - University of Calgary Digital Repository
3
Springer Nature (via Crossref)
3
University of Alberta: Era - Education and Research Archive
3
Wilfrid Laurier University, Ontario: Scholars Commons@Laurier
3
Aarhus University: Research
2
Defense Technical Information Center: DTIC Technical Reports database
2
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
2
German Aerospace Center: elib - DLR electronic library
2
MDPI Open Access Publishing
2
MSpace at the University of Manitoba
2
Queen's University Belfast Research Portal
2
ScienceDirect (Elsevier - via Crossref)
2
ScienceDirect (Elsevier)
2
University of Saskatchewan: eCommons@USASK
2
eCite UTAS (University of Tasmania)
2
DIAL@UCLouvain (Université catholique de Louvain)
1
DIAL@USL-B (Université Saint-Louis, Bruxelles)
1
HELDA – University of Helsinki Open Repository
1
HighWire Press (Stanford University)
1
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System)
1
IRUA - Institutional Repository van de Universiteit Antwerpen
1
Imperial College London: Spiral
1
Informa (via Crossref)
1
Magnolia press
1
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
1
more ...