Content Provider
Zenodo
542
NASA Technical Reports Server (NTRS)
92
Wiley Online Library
90
Charles University CU Digital repository
40
Unknown
32
Jagiellonian University Repository
31
University of Washington, Seattle: Digital Collections
23
UNESDOC - UNESCO Digital Library
20
Copernicus Publications: E-Journals
19
Athabasca University Digitization Portal
18
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
17
BioMed Central
16
Tomsk State University Research Library
15
Lund University Publications Student Papers (LUP-SP)
12
NORA (National aggregator of open repositories of Russian universities)
12
Wageningen UR (University & Research Centre): Digital Library
12
University of Alberta: Era - Education and Research Archive
11
DataverseNO
10
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP)
10
PeerJ Publishing (via CrossRef)
9
Pensoft Publishers
9
Université de Sherbrooke: Savoirs UdeS
8
Institut national de la recherche scientifique, Québec: Espace INRS
7
University of California: eScholarship
7
HELDA – University of Helsinki Open Repository
6
Rothamsted Repository (Rothamsted Research)
6
Université Laval: CorpusUL
6
York University, Toronto: YorkSpace
6
ACS Publications
5
Borealis
5
Claremont Colleges Digital Library (CCDL)
5
Ike Skelton Combined Arms Research Library (CARL) Digital Library
5
Natural Resources Institute Finland: Jukuri
5
eLife
5
neliti (Indonesia's Think Tank Database)
5
Brigham Young University (BYU): Digital Collections
4
Kazan Federal University Digital Repository
4
OSKAR Bordeaux (Open Science Knowledge ARchive)
4
The Winnower
4
Universidade Estadual Paulista São Paulo: Acervo Digital da UNESP / São Paulo State University
4
Aarhus University: Research
3
Arctic Council Repository
3
COS Center for Open Science (via Crossref)
3
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
3
DataCite Metadata Store (German National Library of Science and Technology)
3
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto
3
Max Planck Society: MPG.PuRe
3
National Museum of Ethnology Repository
3
ScienceDirect (Elsevier - via Crossref)
3
The University of Melbourne: Digitised Collections
3
more ...