Content Provider
Unknown
3,866
Copernicus Publications: E-Journals
1,887
Defense Technical Information Center: DTIC Technical Reports database
1,557
PubMed Central (PMC)
1,274
HighWire Press (Stanford University)
549
MDPI Open Access Publishing
543
DataCite Metadata Store (German National Library of Science and Technology)
467
DataCite
301
Hathi Trust Digital Library
276
IRD (Institute de recherche pour le développement): Horizon
255
BioOne Online Journals
81
Florida State University Digital Library (FSUDL)
71
University of Michigan: Digital Collections
69
Florida State University: DigiNole Commons
63
University of Rhode Island: DigitalCommons@URI
59
Open Parks Network
56
Dalhousie University: DalSpace Institutional Repository
33
University of Florida: Digital Library Center
33
W&M ScholarWorks
33
Digital Repository @ Iowa State University
32
Natural Environment Research Council: NERC Open Research Archive
25
Saint Mary's University, Halifax: Institutional Repository
22
UQAM - Université du Québec à Montréal: archipel
20
University of Illinois at Urbana-Champaign: UIUC Digitized Books
19
Washington State University: WSU Libraries Digital Collections
19
Érudit.org (Université Montréal)
18
American Museum of Natural History: AMNH scientific publications
17
University of Central Florida (UCF): STARS (Showcase of Text, Archives, Research & Scholarship)
16
Digital Collections of Colorado (Colorado State University)
15
Mountain Scholar (Digital Collections of Colorado and Wyoming)
15
University of South Carolina Libraries: Scholar Commons
15
OhioLINK: Electronic Theses and Dissertations Center
14
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
13
Florida State University: Publication of Archival Library & Museum Materials
13
LSU Digital Commons (Louisiana State University)
12
AgEcon Search - Research in Agricultural & Applied Economics
11
University of Massachusetts: ScholarWorks@UMass Amherst
11
University of Southampton: e-Prints Soton
11
PennState: Electronic Theses and Dissertations (eTD)
10
Project Gutenberg (PG)
10
The University of Utah: J. Willard Marriott Digital Library
10
University at Albany, State University of New York (SUNY): Scholars Archive
10
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
9
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
9
eCite UTAS (University of Tasmania)
9
Hrčak - Portal of scientific journals of Croatia
8
Project Euclid (Cornell University Library)
8
University of Vienna: Phaidra
8
Digital Repository of Scientific Institutes (RCIN)
7
Harvard University: Harvard Collections
7
more ...