David R. Lide has been Editor-in-Chief of the CRC Handbook of Chemistry and Physics since 1989. He is the author of two books, Basic Laboratory and Industrial Chemicals and Handbook of Thermophysical and Thermochemical Data, as well as more than 100 research papers. George W.A. Milne is a Research Chemist in the National Cancer Institute, one of the National Institutes of Health in Bethesda, MD. He has published over 150 papers and one book and since 1989 has been Editor-in-Chief of the American Chemical Society's Journal of Chemical Information and Computer Sciences