Content Provider
Defense Technical Information Center: DTIC Technical Reports database
820
Ohio State University (OSU): Knowledge Bank
246
University of North Texas: UNT Digital Library
85
LeibnizOpen (The Leibniz Association)
80
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
78
DataCite Metadata Store (German National Library of Science and Technology)
70
Directory of Open Access Journals: DOAJ Articles
56
University of Alberta: Era - Education and Research Archive
56
Unknown
37
UNESDOC - UNESCO Digital Library
34
MDPI Open Access Publishing
20
University of Calgary Journal Hosting
20
University of Wisconsin, Milwaukee: UWM Libraries Digital Collections
20
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
16
Biodiversity Heritage Library (BHL)
13
Université de Nantes: HAL-UNIV-NANTES
13
PANGAEA - Data Publisher for Earth & Environmental Science
12
Open Research Library
11
Zenodo
11
DIAL@USL-B (Université Saint-Louis, Bruxelles)
10
Digital Repository of Scientific Institutes (RCIN)
10
Harvard University: Harvard Collections
10
Institut national des sciences de l'Univers: HAL-INSU
10
CyberLeninka (Scientific Electronic Library)
9
Dartmouth Digital Commons (Dartmouth College)
9
Frontiers: Figshare
9
Texas Tech University: TTU DSpace Repository
9
University of Tasmania: UTas ePrints
9
NILU – Norwegian Institute for Air Research: NILU Brage
8
University of Liège: ORBi (Open Repository and Bibliography)
8
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
7
Wageningen UR (University & Research Centre): Digital Library
7
Digital.CSIC (Spanish National Research Council)
6
HAL Sorbonne Université
6
The Czech Academy of Sciences: Publication Activity (ASEP)
6
University of Michigan: Digital Collections
6
ePLUS - Open Access Publikationsserver der Universität Salzburg
6
Aarhus University: Research
5
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer)
5
Journals at the University of Arizona
5
Masaryk University Journals
5
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen)
5
National Institute of Polar Research Repository, Japan
5
Project Gutenberg (PG)
5
UNEP Document Repository (UN Environment Programme)
5
University of California: eScholarship
5
Australian National University: ANU Digital Collections
4
Biblioteca Digital FCEN-UBA (Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires)
4
Caltech Authors (California Institute of Technology)
4
Digital Commons @ American University Washington College of Law
4
more ...