Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
8,639
DataCite Metadata Store (German National Library of Science and Technology)
5,335
NOAA NCEI Environmental Data Archive (via DataONE)
2,263
DataCite
637
Zenodo
443
Directory of Open Access Journals: DOAJ Articles
251
Unknown
240
Defense Technical Information Center: DTIC Technical Reports database
155
Wiley Online Library
142
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
131
ScienceDirect (Elsevier - via Crossref)
122
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
115
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires)
97
David Rumsey Historical Map Collection (Cartography Associates)
90
ScienceDirect (Elsevier)
88
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
87
Digital.CSIC (Spanish National Research Council)
80
Natural Environment Research Council: NERC Open Research Archive
79
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
76
PubMed Central (PMC)
75
Springer Nature (via Crossref)
75
Université de Nantes: HAL-UNIV-NANTES
73
Institut national des sciences de l'Univers: HAL-INSU
71
Magnolia press
64
University of São Paulo: Digital Library of Theses and Dissertations
64
Biodiversity Heritage Library (BHL)
59
Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP
58
Copernicus Publications: E-Journals
53
Cambridge University Press
52
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
51
University of Cape Town: OpenUCT
49
University of Southampton: e-Prints Soton
40
Frontiers: Figshare
38
HAL Sorbonne Université
37
Research Data Australia (Australian National Data Service - ANDS)
37
Niedersächsisches Online-Archiv NOA
35
USP Production Repository (Universidade de São Paulo)
30
NASA Technical Reports Server (NTRS)
28
Oxford University Press
28
RI FURG (Repositório da Universidade Federal do Rio Grande)
26
SciELO Brazil (Scientific Electronic Library Online)
26
Phaidra Digital Collections (Permanent Hosting, Archiving and Indexing of Digital Resources and Assets - Università degli Studi di Padova)
25
Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University
25
MDPI Open Access Publishing
22
University of California: eScholarship
22
National Library of Australia: Digital Collections
21
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
21
Universidade Federal do Rio Grande do Sul (UFRGS): Lume
21
University of Pretoria: UPSpace
21
Frontiers (Publisher)
20
more ...