Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
97
PANGAEA - Data Publisher for Earth & Environmental Science
5
PubMed Central (PMC)
3
University of Lethbridge Digitized Collections
3
NASA Technical Reports Server (NTRS)
2
University of St Andrews: Digital Research Repository
2
ASM Journals (American Society for Microbiology - via Crossref)
1
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
1
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas)
1
Directory of Open Access Journals: DOAJ Articles
1
Frontiers (Publisher)
1
Gallica - bibliothèque numérique de la Bibliothèque nationale de France (BnF)
1
HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand/Université d'Auvergne)
1
Jurnal Teknologi Pertanian
1
LSU Digital Commons (Louisiana State University)
1
Missouri University of Science and Technology (Missouri S&T): Scholars' Mine
1
PRISM - University of Calgary Digital Repository
1
Persée: Portail de revues scientifiques en sciences humaines et sociales
1
The Hong Kong University of Science and Technology: HKUST Institutional Repository
1
The Online Books Page (Penn Libraries, University of Pennsylvania)
1
University of Pretoria: UPSpace
1
University of Washington, Seattle: Digital Collections
1
Unknown
1
Vytautas Magnus University e-Publication Repository (VMU ePub)
1
Wiley Online Library
1
the Digital Archaeological Record (via DataONE)
1