The NIST Data Gateway provides easy access to NIST scientific and technical data. These data cover a broad range of substances and properties from many different scientific disciplines.
Much of the material appears to be in the public domain as it is produced by the US Federal Government, but it varies from dataset to dataset.
National Institute of Standards and Technology (NIST) Data Gateway. No author.
Retrieved 07:51, May 25, 2013 (UTC).
the Data Hub