Content Provider
Directory of Open Access Journals: DOAJ Articles
426
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
351
PubMed Central (PMC)
182
Hirsla - Landspítali University Hospital research archive
132
DataCite Metadata Store (German National Library of Science and Technology)
76
The University of Utah: J. Willard Marriott Digital Library
67
Memorial University of Newfoundland: Research Repository
66
Wiley Online Library
66
North Dakota State University (NDSU): Digital Horizons
59
PALNI Digital Library Collections (Private Academic Library Network of Indiana)
56
Unknown
53
Washington State University: WSU Libraries Digital Collections
36
SAGE Publications (via Crossref)
34
HighWire Press (Stanford University)
31
University of Lethbridge Digitized Collections
31
Hunter Library Digital Collections (Western Carolina University)
29
Umeå University: Publications (DiVA)
25
University of Tromsø: Munin Open Research Archive
25
Opin vísindi (Iceland)
24
BioMed Central
23
Jultika - University of Oulu repository
22
Springer Nature (via Crossref)
21
Cambridge University Press
20
CyberLeninka (Scientific Electronic Library)
19
University of Washington, Seattle: Digital Collections
19
Ovid (via Crossref)
15
Georgetown University: DigitalGeorgetown
13
HELDA – University of Helsinki Open Repository
13
Oxford University Press (via Crossref)
13
RePEc (Research Papers in Economics)
13
UTSA Digital Collections (The University of Texas at San Antonio)
13
University of Copenhagen: Research
13
SAGE Publications
12
Dove Medical Press
11
Open Access Journal Hosting (University of British Columbia)
11
The BMJ
11
University of Southern Denmark Research Portal
11
Aurora Health Care Digital Repository
10
Memorial University of Newfoundland: Electronic Journals
10
Ohio State University (OSU): Knowledge Bank
9
The University of Alabama at Birmingham: UAB Libraries' Digital Collections
9
WikiBooks - Open-content textbooks
9
Oxford University Press
8
Skemman (Iceland)
8
University of Alberta: Era - Education and Research Archive
8
University of Calgary Journal Hosting
8
University of the Pacific, McGeorge School of Law: Scholarly Commons
8
University of the Pacific: Scholarly Commons
8
MSpace at the University of Manitoba
7
Queensland University of Technology: QUT ePrints
7
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