Content Provider
Unknown
35,355
PubMed Central (PMC)
24,381
Copernicus Publications: E-Journals
13,351
Open Parks Network
12,144
Defense Technical Information Center: DTIC Technical Reports database
11,329
MDPI Open Access Publishing
8,594
DataCite Metadata Store (German National Library of Science and Technology)
8,126
HighWire Press (Stanford University)
7,642
Hathi Trust Digital Library
5,960
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
4,201
DataCite
3,498
Washington State University: WSU Libraries Digital Collections
2,487
BioOne Online Journals
1,792
University of Michigan: Digital Collections
1,548
Érudit.org (Université Montréal)
1,376
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
IRD (Institute de recherche pour le développement): Horizon
1,066
The Catholic University of America: Digital Collections
1,025
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)
576
APS Digital Library (American Philosophical Society)
471
OLAC: Open Language Archives Community
464
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository
445
Digital Repository of Scientific Institutes (RCIN)
422
Project Gutenberg (PG)
421
OhioLINK: Electronic Theses and Dissertations Center
337
University of Northern Iowa: UNI ScholarWorks
323
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
314
UQAM - Université du Québec à Montréal: archipel
298
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
266
Natural Environment Research Council: NERC Open Research Archive
264
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
243
Arca (BC's Digital Treasures)
241
Yale University: EliScholar
215
Digital Repository @ Iowa State University
199
Swedish University of Agricultural Sciences: Epsilon Archive for Student Projects
193
Saint Mary's University, Halifax: Institutional Repository
191
Dalhousie University: DalSpace Institutional Repository
183
American Museum of Natural History: AMNH scientific publications
174
The University of Western Ontario: Scholarship@Western
167
University of Rhode Island: DigitalCommons@URI
167
Hrčak - Portal of scientific journals of Croatia
166
Florida State University Digital Library (FSUDL)
165
Texas Tech University: TTU DSpace Repository
164
more ...