Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
4,627
NOAA NCEI Environmental Data Archive (via DataONE)
1,227
Unknown
218
Directory of Open Access Journals: DOAJ Articles
178
LeibnizOpen (The Leibniz Association)
116
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
99
USGS Science Data Catalog (via DataONE)
74
Copernicus Publications: E-Journals
73
Université de Nantes: HAL-UNIV-NANTES
72
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
67
PANGAEA - Data Publisher for Earth & Environmental Science
61
PubMed Central (PMC)
49
Niedersächsisches Online-Archiv NOA
45
Wiley Online Library
43
University of Southampton: e-Prints Soton
42
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
41
Natural Environment Research Council: NERC Open Research Archive
39
University of California: eScholarship
37
MDPI Open Access Publishing
36
Defense Technical Information Center: DTIC Technical Reports database
34
Institut national des sciences de l'Univers: HAL-INSU
32
Digital.CSIC (Spanish National Research Council)
31
Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences)
30
Springer Nature (via Crossref)
30
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
28
Max Planck Society: MPG.PuRe
25
Indian Academy of Sciences: Publication of Fellows
24
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
21
NASA Technical Reports Server (NTRS)
21
Biological and Chemical Oceanography Data Management Office (BCO-DMO) (via DataONE)
20
Ministry of Earth Sciences, Government of India: Open Access Digital Repository
18
University of East Anglia: UEA Digital Repository
18
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
18
Frontiers: Figshare
15
ORA - Oxford University Research Archive
15
RePEc (Research Papers in Economics)
15
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
15
University College London: UCL Discovery
15
Université de Paris: Portail HAL
15
Utrecht University Repository
14
WikiBooks - Open-content textbooks
14
Australian National University: ANU Digital Collections
13
CentAUR: Central Archive at the University of Reading
13
Columbia University: Academic Commons
13
eCite UTAS (University of Tasmania)
13
Cardiff University: ORCA (Online Research @ Cardiff)
12
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
12
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
12
Collège de France: HAL
10
Frontiers (Publisher)
10
more ...