Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
7,938
Unknown
3,929
PubMed Central (PMC)
2,476
Copernicus Publications: E-Journals
1,931
MDPI Open Access Publishing
911
Defense Technical Information Center: DTIC Technical Reports database
834
HighWire Press (Stanford University)
580
ArXiv.org (Cornell University Library)
508
eCite UTAS (University of Tasmania)
363
Hathi Trust Digital Library
224
Natural Environment Research Council: NERC Open Research Archive
201
The University of Maine: DigitalCommons@UMaine
187
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
179
Open Parks Network
178
Texas Tech University: TTU DSpace Repository
174
LSU Digital Commons (Louisiana State University)
157
Research Data Australia (Australian National Data Service - ANDS)
149
University of Nebraska-Lincoln: DigitalCommons@UNL
146
University of Michigan: Digital Collections
133
W&M ScholarWorks
116
BioOne Online Journals
105
University of Rhode Island: DigitalCommons@URI
103
IRD (Institute de recherche pour le développement): Horizon
100
Digital Commons University of South Florida (USF)
87
CyberLeninka (Scientific Electronic Library)
79
Montclair State University Digital Commons
66
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
58
University of Colorado, Boulder: CU Scholar
56
OhioLINK: Electronic Theses and Dissertations Center
53
University of New Hampshire: Scholars Repository
52
University of Massachusetts: ScholarWorks@UMass Amherst
50
Portland State University: PDXScholar
49
Utah State University: DigitalCommons@USU
43
Central Washington University: ScholarWorks
35
Purdue University: e-Pubs
35
University of Wollongong, Australia: Research Online
35
Washington State University: WSU Libraries Digital Collections
30
Harvard University: Harvard Collections
29
Brigham Young University (BYU): ScholarsArchive
28
Digital Repository of Scientific Institutes (RCIN)
26
The Online Books Page (Penn Libraries, University of Pennsylvania)
25
The University of Southern Mississippi: The Aquila Digital Community
25
University of Florida: Digital Library Center
23
Project Gutenberg (PG)
22
San José State University: SJSU ScholarWorks
22
Arctic Portal Library
20
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
20
David Rumsey Historical Map Collection (Cartography Associates)
19
Florida State University Digital Library (FSUDL)
19
Florida State University: DigiNole Commons
19
more ...