Content Provider
Defense Technical Information Center: DTIC Technical Reports database
97
Unknown
42
Copernicus Publications: E-Journals
34
PubMed Central (PMC)
16
MDPI Open Access Publishing
11
HighWire Press (Stanford University)
7
DataCite Metadata Store (German National Library of Science and Technology)
6
University of South Carolina Libraries: Scholar Commons
6
IRD (Institute de recherche pour le développement): Horizon
3
Memorial University of Newfoundland: Digital Archives Initiative (DAI)
1
University of Connecticut (UConn): DigitalCommons@UConn
1
Université du Québec à Chicoutimi (UQAC): Constellation
1