Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2,747
ArXiv.org (Cornell University Library)
1,099
Unknown
825
PANGAEA - Data Publisher for Earth & Environmental Science
693
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
382
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
332
NASA Technical Reports Server (NTRS)
320
Directory of Open Access Journals: DOAJ Articles
318
David Rumsey Historical Map Collection (Cartography Associates)
314
Université de Nantes: HAL-UNIV-NANTES
270
University of California: eScholarship
243
Zenodo
239
Caltech Authors (California Institute of Technology)
223
CERN Document Server (CDS)
196
Institut national des sciences de l'Univers: HAL-INSU
192
DESY Publication Database (PUBDB)
138
ScienceDirect (Elsevier - via Crossref)
133
Cardiff University: ORCA (Online Research @ Cardiff)
132
Cambridge University Press
130
WikiBooks - Open-content textbooks
126
DSpace@MIT (Massachusetts Institute of Technology)
114
Springer Nature (via Crossref)
110
Copernicus Publications: E-Journals
106
National Library of Australia: Digital Collections
104
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
100
German Aerospace Center: elib - DLR electronic library
100
Max Planck Society: MPG.PuRe
100
University College London: UCL Discovery
97
ORA - Oxford University Research Archive
93
KITopen (Karlsruhe Institute of Technologie)
85
Niedersächsisches Online-Archiv NOA
78
National Institute of Polar Research Repository, Japan
71
University of Washington, Seattle: Digital Collections
71
Natural Environment Research Council: NERC Open Research Archive
70
Defense Technical Information Center: DTIC Technical Reports database
67
PubMed Central (PMC)
63
HighWire Press (Stanford University)
59
Research Data Australia (Australian National Data Service - ANDS)
58
Cambridge University Press (via Crossref)
57
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
55
AIP Publishing
54
Ghent University Academic Bibliography
52
IEDA: US Antarctic Program Data Center (via DataONE)
50
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
50
HAL Sorbonne Université
49
Wiley Online Library (via Crossref)
49
Padua Research Archive (IRIS - Università degli Studi di Padova)
48
ScienceDirect (Elsevier)
48
University of North Texas: UNT Digital Library
44
The University of Arizona: UA Campus Repository
43
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