Content Provider
Defense Technical Information Center: DTIC Technical Reports database
3,320
Directory of Open Access Journals: DOAJ Articles
907
Unknown
600
Wiley Online Library
560
DataCite
556
DataCite Metadata Store (German National Library of Science and Technology)
538
PANGAEA - Data Publisher for Earth & Environmental Science
505
Copernicus Publications: E-Journals
422
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
265
Niedersächsisches Online-Archiv NOA
246
LeibnizOpen (The Leibniz Association)
194
MDPI Open Access Publishing
181
Institut national des sciences de l'Univers: HAL-INSU
166
Université de Nantes: HAL-UNIV-NANTES
166
PubMed Central (PMC)
135
Canadian Science Publishing
123
Cambridge University Press
112
Université Savoie Mont Blanc: HAL
104
Université Grenoble Alpes: HAL
95
Vrije Universiteit Amsterdam (VU): Research Portal
83
National Research Council Canada: NRC Publications Archive
77
Zenodo
75
University of Potsdam: publish.UP
71
University of Zurich (UZH): ZORA (Zurich Open Repository and Archive
70
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
67
University of Alaska: ScholarWorks@UA
60
Universitet i Oslo: Digitale utgivelser ved UiO (DUO)
57
University of Calgary Journal Hosting
56
University of St Andrews: Research Portal
55
Carleton University's Institutional Repository
54
Technical University of Denmark: DTU Orbit
48
Aarhus University: Research
45
ETH Zürich Research Collection
45
Archives ouvertes de Paris-Saclay
44
Arctic Council Repository
44
Springer Nature (via Crossref)
44
Canadian Science Publishing (via Crossref)
42
University of North Texas: UNT Digital Library
41
ScienceDirect (Elsevier - via Crossref)
38
University of Copenhagen: Research
37
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
36
DIAL@USL-B (Université Saint-Louis, Bruxelles)
35
Lund University Publications (LUP)
35
University of California: eScholarship
35
Institut National de la Recherche Agronomique: ProdINRA
33
RERO DOC Digital Library
33
ScienceDirect (Elsevier)
32
HAL Sorbonne Université
31
DIAL@UCLouvain (Université catholique de Louvain)
30
Theses Canada/Thèses Canada (Library and Archives Canada)
29
more ...