Content Provider
PANGAEA - Data Publisher for Earth & Environmental Science
3,706
NOAA NCEI Environmental Data Archive (via DataONE)
726
DataCite Metadata Store (German National Library of Science and Technology)
368
LeibnizOpen (The Leibniz Association)
22
Defense Technical Information Center: DTIC Technical Reports database
19
USGS Science Data Catalog (via DataONE)
5
Dryad Digital Repository (Duke University)
3
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
3
Unknown
3
CMRE Open Library (NATO STO Centre for Maritime Research and Experimentation
1
CyberLeninka (Scientific Electronic Library)
1
Directory of Open Access Journals: DOAJ Articles
1
Frontiers: Figshare
1
Missouri University of Science and Technology (Missouri S&T): Scholars' Mine
1
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover)
1
Saint Petersburg State University: Research Repository (DSpace SPbU)
1