Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2,462
Unknown
1,383
PubMed Central (PMC)
1,059
HighWire Press (Stanford University)
689
MDPI Open Access Publishing
308
Hathi Trust Digital Library
279
Copernicus Publications: E-Journals
262
Yale University: EliScholar
235
Defense Technical Information Center: DTIC Technical Reports database
234
North Dakota State University (NDSU): Digital Horizons
117
University of Michigan: Digital Collections
110
ArXiv.org (Cornell University Library)
72
norden (Nordic Council of Ministers): Publications (DiVA)
66
CyberLeninka (Scientific Electronic Library)
62
Arctic Portal Library
57
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
54
Project Gutenberg (PG)
51
Oregon Institue of Technology (OIT): Digital Collections
48
University of Rhode Island: DigitalCommons@URI
46
University of Nebraska-Lincoln: DigitalCommons@UNL
45
Iowa State University Library Digital Collections
37
Hrčak - Portal of scientific journals of Croatia
35
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
32
IRD (Institute de recherche pour le développement): Horizon
31
The Online Books Page (Penn Libraries, University of Pennsylvania)
28
SIT Digital Collections
27
AMAD - "Archivum Medii Aevi Digitale - Specialized open access repository for research in the middle ages"
26
University of New Hampshire: Scholars Repository
26
David Rumsey Historical Map Collection (Cartography Associates)
24
The University of Utah: J. Willard Marriott Digital Library
24
Embry-Riddle Aeronautical University: ERAU Scholarly Commons
23
Western Kentucky University (WKU): TopScholar
23
University of Michigan Law School: Scholarship Repository
21
BioOne Online Journals
20
Natural Environment Research Council: NERC Open Research Archive
20
The London School of Economics and Political Science: LSE Research Online
20
Brigham Young University (BYU): ScholarsArchive
18
Digital Repository of Scientific Institutes (RCIN)
18
Michigan Technological University: Digital Commons @ Michigan Tech
18
University of Cumbria: Insight
18
University of Massachusetts: ScholarWorks@UMass Amherst
18
JSU Digital Commons (Jacksonville State University)
17
Portland Public Library: Digital Commons
17
The College of Wooster: Open Works
17
Washington State University: WSU Libraries Digital Collections
17
Érudit.org (Université Montréal)
17
University of Gothenburg: GUPEA (Gothenburg University Publications Electronic Archive)
16
University of the Pacific, McGeorge School of Law: Scholarly Commons
16
University of the Pacific: Scholarly Commons
16
OhioLINK: Electronic Theses and Dissertations Center
15
more ...