Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
863
Defense Technical Information Center: DTIC Technical Reports database
405
PANGAEA - Data Publisher for Earth & Environmental Science
321
Directory of Open Access Journals: DOAJ Articles
286
DataCite
233
Unknown
224
Wiley Online Library
167
University of Alaska: ScholarWorks@UA
162
Copernicus Publications: E-Journals
113
Niedersächsisches Online-Archiv NOA
73
PubMed Central (PMC)
66
University of Calgary Journal Hosting
61
MDPI Open Access Publishing
51
University of North Texas: UNT Digital Library
51
LeibnizOpen (The Leibniz Association)
42
Canadian Science Publishing
28
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
26
ScienceDirect (Elsevier - via Crossref)
25
Cambridge University Press
24
University of Potsdam: publish.UP
24
University of California: eScholarship
22
Université de Nantes: HAL-UNIV-NANTES
20
DIAL@UCLouvain (Université catholique de Louvain)
19
DIAL@USL-B (Université Saint-Louis, Bruxelles)
19
Springer Nature (via Crossref)
19
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences)
17
ScienceDirect (Elsevier)
16
Institut national des sciences de l'Univers: HAL-INSU
13
Zenodo
13
Hathi Trust Digital Library
11
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
11
PQDT Open: Open Access Dissertations and Theses (ProQuest)
11
Université Grenoble Alpes: HAL
11
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
10
University of Texas at El Paso: Digital Commons@UTEP
10
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
10
Max Planck Society: MPG.PuRe
9
University of Copenhagen: Research
9
National Research Council Canada: NRC Publications Archive
8
Oxford University Press
8
Royal Holloway University of London: Royal Holloway Digital Repository
8
Vrije Universiteit Amsterdam (VU): Research Portal
8
Aarhus University: Research
7
Caltech Authors (California Institute of Technology)
7
Canadian Science Publishing (via Crossref)
7
HAL Sorbonne Université
7
Ohio State University (OSU): Knowledge Bank
7
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
7
SAGE Publications
7
The Royal Society
7
more ...