\ BooknewsThe first volume addresses the fundamental concepts used in the treatment of single-degree-of-freedom systems. Subjects covered include the mathematical model of the system, stability of motion, and the principal approximate analytical methods used to describe both harmonic and non-harmonic oscillations. The second volume enlarges on the fundamental concepts by exploring the analysis of nonlinear vibrations in multi-degree-of-freedom systems. New material on free, forced and parametric oscillations is also described. Annotation c. Book News, Inc., Portland, OR (booknews.com)\ \