Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
1,069
Defense Technical Information Center: DTIC Technical Reports database
405
PANGAEA - Data Publisher for Earth & Environmental Science
311
Directory of Open Access Journals: DOAJ Articles
262
Unknown
224
University of Alaska: ScholarWorks@UA
162
Copernicus Publications: E-Journals
106
Wiley Online Library
104
Niedersächsisches Online-Archiv NOA
72
PubMed Central (PMC)
65
University of Calgary Journal Hosting
61
MDPI Open Access Publishing
51
University of North Texas: UNT Digital Library
51
Wiley Online Library (via Crossref)
47
LeibnizOpen (The Leibniz Association)
40
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
Canadian Science Publishing
20
Université de Nantes: HAL-UNIV-NANTES
20
Springer Nature (via Crossref)
19
DIAL@UCLouvain (Université catholique de Louvain)
17
DIAL@USL-B (Université Saint-Louis, Bruxelles)
17
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences)
17
ScienceDirect (Elsevier)
16
Canadian Science Publishing (via Crossref)
14
Institut national des sciences de l'Univers: HAL-INSU
13
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
11
PQDT Open: Open Access Dissertations and Theses (ProQuest)
11
Université Grenoble Alpes: HAL
11
Zenodo
11
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
10
Hathi Trust Digital Library
10
University of Texas at El Paso: Digital Commons@UTEP
10
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
10
University of Copenhagen: Research
9
Max Planck Society: MPG.PuRe
8
National Research Council Canada: NRC Publications Archive
8
Royal Holloway University of London: Royal Holloway Digital Repository
8
Aarhus University: Research
7
HAL Sorbonne Université
7
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
7
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
7
Vrije Universiteit Amsterdam (VU): Research Portal
7
ETH Zürich Research Collection
6
HELDA – University of Helsinki Open Repository
6
Montana State University (MSU): ScholarWorks
6
National Institute of Polar Research Repository, Japan
6
more ...