Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
69,224
Unknown
35,804
PubMed Central (PMC)
24,377
CyberLeninka (Scientific Electronic Library)
17,438
Open Parks Network
12,450
Copernicus Publications: E-Journals
12,292
Defense Technical Information Center: DTIC Technical Reports database
11,329
MDPI Open Access Publishing
8,594
HighWire Press (Stanford University)
7,634
Hathi Trust Digital Library
6,995
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
4,403
ArXiv.org (Cornell University Library)
4,119
Érudit.org (Université Montréal)
2,724
Washington State University: WSU Libraries Digital Collections
2,492
University of Nebraska-Lincoln: DigitalCommons@UNL
2,443
University of Michigan: Digital Collections
2,403
OLAC: Open Language Archives Community
2,048
BioOne Online Journals
1,792
Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky: IVS FEB RAS Repository
1,501
University of the Pacific: Scholarly Commons
1,464
University of the Pacific, McGeorge School of Law: Scholarly Commons
1,462
North Dakota State University (NDSU): Digital Horizons
1,349
Iowa State University Library Digital Collections
1,196
David Rumsey Historical Map Collection (Cartography Associates)
1,152
University of New Hampshire: Scholars Repository
1,129
University of Rhode Island: DigitalCommons@URI
1,074
The University of Maine: DigitalCommons@UMaine
1,039
The Catholic University of America: Digital Collections
1,030
University of Massachusetts: ScholarWorks@UMass Amherst
1,020
Utah State University: DigitalCommons@USU
994
APS Digital Library (American Philosophical Society)
971
IRD (Institute de recherche pour le développement): Horizon
935
eCite UTAS (University of Tasmania)
832
Bavarian Digital Repository (BDR - Bayerische Staatsbibliothek Munich, BSB)
801
University of Florida: Digital Library Center
793
Digital Commons University of South Florida (USF)
742
EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne)
729
Frankfurt/Main University Library: Digitale Sammlungen
729
University of South Florida St. Petersburg: Digital USFSP
678
Digital Repository of Scientific Institutes (RCIN)
642
W&M ScholarWorks
641
DigiZeitschriften: The German digital journal archive (Göttingen University Library)
619
Duke Law School Scholarship Repository
617
SFU Digitized Collections (Simon Fraser University)
612
UQAM - Université du Québec à Montréal: archipel
590
University of Northern Iowa: UNI ScholarWorks
576
LSU Digital Commons (Louisiana State University)
573
Western Washington University: CEDAR (Contributing to Education through Digital Access to Research)
572
Natural Environment Research Council: NERC Open Research Archive
544
Project Gutenberg (PG)
517
more ...