NIST Standard Reference Data
For over 40 years, NIST has provided well-documented numeric data to scientists and engineers for use in technical problem-solving, research, and development. These recommended values are based on data which have been extracted from the world's literature, assessed for reliability, and then evaluated to select the preferred values. These data activities are conducted by scientists at NIST.
Standard Reference Data:
Robert L. Watters,Jr.
robert.watters [at] nist.gov (robert[dot]watters[at]nist[dot]gov)