Mass spectrometry is used extensively to identify unkown chemicals in almost all areas of chemistry, biochemistry, medical chemistry, and the environmental sciences. This massive work has been compiled and written by two acknowledged leaders in their field. McLafferty and Stauffer are the authors of two previous books on mass spectral data, and of various database versions of the data--but the present 7-volume work, Registry of Mass Spectral Data, 2nd Edition is, by far, the most complete and up-to-date collection of mass spectra available in book form. In it are presented the registry spectra for 108,173 compounds.