Content Provider
DataCite Metadata Store (German National Library of Science and Technology)
2,499
WikiBooks - Open-content textbooks
5
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center)
4
Research Data Australia (Australian National Data Service - ANDS)
4
David Rumsey Historical Map Collection (Cartography Associates)
3
NOAA NCEI Environmental Data Archive (via DataONE)
3
Curtin University: espace
1
CyberLeninka (Scientific Electronic Library)
1
NASA Technical Reports Server (NTRS)
1
North-West University, South Africa: Boloka (NWU-IR)
1
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy)
1
The Library of Congress: American Memory
1
University of Calgary Journal Hosting
1
Unknown
1