Content Provider
Unknown
35,362
PubMed Central (PMC)
24,374
Copernicus Publications: E-Journals
12,292
Open Parks Network
12,144
Defense Technical Information Center: DTIC Technical Reports database
11,329
DataCite Metadata Store (German National Library of Science and Technology)
8,713
MDPI Open Access Publishing
8,594
HighWire Press (Stanford University)
7,632
Hathi Trust Digital Library
5,040
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
4,201
Washington State University: WSU Libraries Digital Collections
2,487
BioOne Online Journals
1,779
University of Michigan: Digital Collections
1,548
Érudit.org (Université Montréal)
1,348
University of the Pacific, McGeorge School of Law: Scholarly Commons
1,341
University of the Pacific: Scholarly Commons
1,341
Iowa State University Library Digital Collections
1,189
The Catholic University of America: Digital Collections
1,025
IRD (Institute de recherche pour le développement): Horizon
832
eCite UTAS (University of Tasmania)
832
University of Florida: Digital Library Center
718
SFU Digitized Collections (Simon Fraser University)
612
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
572
APS Digital Library (American Philosophical Society)
471
OLAC: Open Language Archives Community
464
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository
442
Digital Repository of Scientific Institutes (RCIN)
422
Project Gutenberg (PG)
415
OhioLINK: Electronic Theses and Dissertations Center
337
Mountain Scholar (Digital Collections of Colorado and Wyoming)
317
Digital Collections of Colorado (Colorado State University)
316
The University of Utah: J. Willard Marriott Digital Library
312
UQAM - Université du Québec à Montréal: archipel
298
Natural Environment Research Council: NERC Open Research Archive
272
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
266
Arca (BC's Digital Treasures)
258
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
243
University of Northern Iowa: UNI ScholarWorks
239
Yale University: EliScholar
215
Digital Repository @ Iowa State University
199
Swedish University of Agricultural Sciences: Epsilon Archive for Student Projects
190
Saint Mary's University, Halifax: Institutional Repository
188
American Museum of Natural History: AMNH scientific publications
174
University of Rhode Island: DigitalCommons@URI
167
The University of Western Ontario: Scholarship@Western
166
Florida State University Digital Library (FSUDL)
165
Hrčak - Portal of scientific journals of Croatia
165
Texas Tech University: TTU DSpace Repository
164
Hunter Library Digital Collections (Western Carolina University)
162
norden (Nordic Council of Ministers): Publications (DiVA)
152
more ...