4. The National Geologic
Map Database
Distributed archive of
standardized geoscience
information for the US.
5. DRYAD.ORG
DataDryad.org is a curated general-
purpose repository that makes the data
underlying scientific publications
discoverable, freely reusable, and citable
6. NIST Physical Reference Data
Specialized data collections provided
by the NIST Physical Measurement
Laboratory.