Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
27,955
NOAA NCEI Environmental Data Archive (via DataONE)
1,532
PANGAEA - Data Publisher for Earth & Environmental Science
1,424
Unknown
1,424
David Rumsey Historical Map Collection (Cartography Associates)
1,320
Directory of Open Access Journals: DOAJ Articles
1,230
APS Digital Library (American Philosophical Society)
1,229
SFU Digitized Collections (Simon Fraser University)
1,070
The Catholic University of America: Digital Collections
1,024
University of Washington, Seattle: Digital Collections
971
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
849
Zenodo
725
Research Data Australia (Australian National Data Service - ANDS)
696
Université de Nantes: HAL-UNIV-NANTES
625
University of Michigan: Digital Collections
542
Hathi Trust Digital Library
422
PubMed Central (PMC)
344
North Dakota State University (NDSU): Digital Horizons
341
Institut national des sciences de l'Univers: HAL-INSU
317
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
280
University of Lethbridge Digitized Collections
277
Copernicus Publications: E-Journals
271
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
253
The Library of Congress: American Memory
230
University of British Columbia: cIRcle - UBC's Information Repository
225
Natural Environment Research Council: NERC Open Research Archive
222
Washington State University: WSU Libraries Digital Collections
221
eCite UTAS (University of Tasmania)
221
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
219
LeibnizOpen (The Leibniz Association)
219
University of California: eScholarship
212
Springer Nature (via Crossref)
202
National Institute of Polar Research Repository, Japan
195
ScienceDirect (Elsevier - via Crossref)
194
Cambridge University Press
183
Niedersächsisches Online-Archiv NOA
182
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
181
University of Tasmania: UTas ePrints
181
The University of Winnipeg: WinnSpace Repository
179
Biodiversity Heritage Library (BHL)
177
Wiley Online Library (via Crossref)
176
Theses Canada/Thèses Canada (Library and Archives Canada)
172
Open Parks Network
165
Oklahoma State University: Digital Collections @ OKSTATE Library
158
Defense Technical Information Center: DTIC Technical Reports database
156
University of Southampton: e-Prints Soton
156
The Seattle Public Library Special Collections Online
153
Wiley Online Library
153
WikiBooks - Open-content textbooks
146
Arca (BC's Digital Treasures)
140
more ...