Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
512
Directory of Open Access Journals: DOAJ Articles
111
Zenodo
110
Digital.CSIC (Spanish National Research Council)
100
University of Michigan: Digital Collections
92
Cambridge University Press
90
Natural Environment Research Council: NERC Open Research Archive
87
Springer Nature (via Crossref)
74
Unknown
64
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires)
62
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
62
ScienceDirect (Elsevier - via Crossref)
49
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
39
PANGAEA - Data Publisher for Earth & Environmental Science
37
PubMed Central (PMC)
28
Frontiers: Figshare
26
Dipòsit Digital de la Universitat de Barcelona
23
Dryad Digital Repository (Duke University)
21
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
21
LeibnizOpen (The Leibniz Association)
20
MDPI Open Access Publishing
19
Research Data Australia (Australian National Data Service - ANDS)
19
Universidade de Lisboa: repositório.UL
18
Wiley Online Library (via Crossref)
18
IEDA: Marine-Geo Digital Library (via DataONE)
17
Biodiversity Heritage Library (BHL)
16
De Gruyter (via Crossref)
16
David Rumsey Historical Map Collection (Cartography Associates)
13
Ghent University Academic Bibliography
13
AU Digital Research Archive (American University)
12
Universidad de Las Palmas de Gran Canaria: Acceda
12
Arctic Portal Library
11
Geological Quarterly
11
National Institute of Polar Research Repository, Japan
11
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
11
Universidad Nacional de La Plata (UNLP): SeDiCI (Servicio de Difusión de la Creación Intelectual)
11
Wiley Online Library
11
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
10
IRUA - Institutional Repository van de Universiteit Antwerpen
10
Instituto Español de Oceanografía: e-IEO
10
Copernicus Publications: E-Journals
9
Digital Commons University of South Florida (USF)
9
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
9
Informa (via Crossref)
9
Nanjing Institute of Geology and Palaeontology: NIGPAS OpenIR (Chinese Academy of Sciences)
9
ScienceDirect (Elsevier)
9
Universidade Estadual Paulista São Paulo: Repositório Institucional UNESP
9
Masaryk University Journals
8
Purdue University: e-Pubs
8
Magnolia press
7
more ...