From the Online Interactive Books and Database Web site Knovel comes the Smithsonian Physical Tables 9th Edition. "Originally published by the Smithsonian Institution Press, this classic reference source comprises 901 tables of general interest to scientists and engineers, and of particular interest to those involved with physics in its larger sense." The downloadable tables include general physics constants, constants for temperature measurement, the blackbody and its radiant energy, temperature characteristics by material, latent heat, thermal properties of gases, acoustics, geomagnetism, and many more. This free service provides a wealth of important and helpful information that scientists and researchers everywhere should fully utilize.