Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
16,718
PANGAEA - Data Publisher for Earth & Environmental Science
8,722
Arctic Data Center (via DataONE)
2,745
Unknown
2,096
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
1,713
NOAA NCEI Environmental Data Archive (via DataONE)
1,527
Directory of Open Access Journals: DOAJ Articles
1,410
David Rumsey Historical Map Collection (Cartography Associates)
1,281
Defense Technical Information Center: DTIC Technical Reports database
1,048
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
659
ScienceDirect (Elsevier - via Crossref)
607
Copernicus Publications: E-Journals
579
Zenodo
569
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
500
Springer Nature (via Crossref)
449
Niedersächsisches Online-Archiv NOA
401
LeibnizOpen (The Leibniz Association)
368
PubMed Central (PMC)
328
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
324
Université de Nantes: HAL-UNIV-NANTES
306
Frontiers: Figshare
286
University of Tromsø: Munin Open Research Archive
266
Institut national des sciences de l'Univers: HAL-INSU
212
Digital.CSIC (Spanish National Research Council)
204
Natural Environment Research Council: NERC Open Research Archive
197
MDPI Open Access Publishing
192
Research Workspace (via DataONE)
181
University of Southampton: e-Prints Soton
181
ScienceDirect (Elsevier)
169
Max Planck Society: MPG.PuRe
163
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
154
Cambridge University Press
149
Biodiversity Heritage Library (BHL)
148
University of Bergen: Bergen Open Research Archive (BORA-UiB)
146
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
140
University of Calgary Journal Hosting
137
Wiley Online Library
135
Naval Postgraduate School: Calhoun
132
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
123
National Institute of Polar Research Repository, Japan
121
USGS Science Data Catalog (via DataONE)
115
Frontiers (Publisher)
113
Springer Nature
109
NASA Technical Reports Server (NTRS)
108
University College London: UCL Discovery
104
University of New Hampshire: Scholars Repository
103
Technical University of Denmark: DTU Orbit
101
University of California: eScholarship
101
Aarhus University: Research
100
Xiamen University Institutional Repository
98
more ...