Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,475
PANGAEA - Data Publisher for Earth & Environmental Science
1,419
Directory of Open Access Journals: DOAJ Articles
1,180
Unknown
1,105
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
788
SFU Digitized Collections (Simon Fraser University)
642
Université de Nantes: HAL-UNIV-NANTES
588
PubMed Central (PMC)
341
Institut national des sciences de l'Univers: HAL-INSU
279
Copernicus Publications: E-Journals
271
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
269
eCite UTAS (University of Tasmania)
221
LeibnizOpen (The Leibniz Association)
213
University of British Columbia: cIRcle - UBC's Information Repository
210
ScienceDirect (Elsevier - via Crossref)
191
Niedersächsisches Online-Archiv NOA
182
Springer Nature (via Crossref)
180
The University of Winnipeg: WinnSpace Repository
176
National Institute of Polar Research Repository, Japan
175
Cambridge University Press
173
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
172
Wiley Online Library (via Crossref)
169
Hathi Trust Digital Library
162
Oklahoma State University: Digital Collections @ OKSTATE Library
157
Washington State University: WSU Libraries Digital Collections
149
WikiBooks - Open-content textbooks
143
The Seattle Public Library Special Collections Online
140
Defense Technical Information Center: DTIC Technical Reports database
137
Wiley Online Library
135
University of the Pacific, McGeorge School of Law: Scholarly Commons
118
University of the Pacific: Scholarly Commons
118
University of Lethbridge Digitized Collections
115
University of Tasmania: UTas ePrints
115
HAL Sorbonne Université
109
Natural Environment Research Council: NERC Open Research Archive
108
University of Southampton: e-Prints Soton
103
National Institute of Oceanography, India: Digital Repository Service (DRS@nio)
99
HAL - Université de La Rochelle
98
HighWire Press (Stanford University)
90
Theses Canada/Thèses Canada (Library and Archives Canada)
89
University of Calgary Journal Hosting
85
MDPI Open Access Publishing
80
Université de Bretagne Occidentale: HAL
80
Digital.CSIC (Spanish National Research Council)
75
oURspace - The University of Regina's Institutional Repository
73
ScienceDirect (Elsevier)
68
Central Marine Fisheries Research Institute, Kochi, India: Eprints@CMFRI
67
Magnolia press
67
Hunter Library Digital Collections (Western Carolina University)
65
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
62
more ...