Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
27,739
NOAA NCEI Environmental Data Archive (via DataONE)
1,532
PANGAEA - Data Publisher for Earth & Environmental Science
1,419
Unknown
1,391
David Rumsey Historical Map Collection (Cartography Associates)
1,287
Directory of Open Access Journals: DOAJ Articles
1,192
SFU Digitized Collections (Simon Fraser University)
1,012
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
847
Zenodo
724
Research Data Australia (Australian National Data Service - ANDS)
694
Université de Nantes: HAL-UNIV-NANTES
624
University of Washington, Seattle: Digital Collections
418
University of Michigan: Digital Collections
395
PubMed Central (PMC)
341
North Dakota State University (NDSU): Digital Horizons
333
Institut national des sciences de l'Univers: HAL-INSU
291
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
279
Copernicus Publications: E-Journals
271
Natural Environment Research Council: NERC Open Research Archive
222
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)
213
University of British Columbia: cIRcle - UBC's Information Repository
210
Springer Nature (via Crossref)
202
National Institute of Polar Research Repository, Japan
195
ScienceDirect (Elsevier - via Crossref)
194
University of California: eScholarship
191
Niedersächsisches Online-Archiv NOA
182
Cambridge University Press
181
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
181
University of Tasmania: UTas ePrints
181
The University of Winnipeg: WinnSpace Repository
176
Wiley Online Library (via Crossref)
174
Hathi Trust Digital Library
166
Oklahoma State University: Digital Collections @ OKSTATE Library
158
University of Southampton: e-Prints Soton
156
Washington State University: WSU Libraries Digital Collections
153
Wiley Online Library
151
The Seattle Public Library Special Collections Online
148
WikiBooks - Open-content textbooks
145
Defense Technical Information Center: DTIC Technical Reports database
137
University of the Pacific, McGeorge School of Law: Scholarly Commons
137
University of the Pacific: Scholarly Commons
137
University of Lethbridge Digitized Collections
135
Indian Academy of Sciences: Publication of Fellows
129
Digital.CSIC (Spanish National Research Council)
125
University of Nebraska-Lincoln: DigitalCommons@UNL
119
Theses Canada/Thèses Canada (Library and Archives Canada)
112
HAL Sorbonne Université
111
RePEc (Research Papers in Economics)
111
more ...