**Shell Vibration** By Arthur W. Leissa, published in 1973. The book compiles and presents a unified discussion of various results on shell vibrations, focusing primarily on circular cylindrical shells. It compares frequencies predicted by different shell equations with those from three-dimensional elasticity and experiments, providing extensive frequency predictions for various boundary conditions. The book also briefly covers noncircular cylindrical and conical shells, but only includes a bibliography for spherical and other shells. It is recommended as a useful reference for engineers and theoreticians working with vibrating shells. **Elastic Wave Propagation** By J. D. Achenbach, published in 1973. This comprehensive monograph on elastodynamics aims to convey the fascinating aspects of wave propagation phenomena and the elegant mathematics involved. The book begins with basic concepts of one-dimensional linear waves and then delves into the mathematical foundations of linear elastodynamics, including proofs of uniqueness and dynamic reciprocal theorems. Chapters 4-9 cover various problems and classes of solutions in elastic wave theory, starting with two-dimensional antiplane strain (SH-waves) and progressing to more complex two-dimensional plane strain (P and SV-waves) models, and finally, the full three-dimensional situation. The book includes detailed treatments of steady-state harmonic wave analysis, reflection and refraction of plane waves, harmonic waves in plates and rods, transform methods, transient waves, and Wiener-Hopf methods. It concludes with introductions to thermoelastic, viscoelastic, anisotropic, and nonlinear waves. The book is highly recommended for both students and scholars in elastodynamics.**Shell Vibration** By Arthur W. Leissa, published in 1973. The book compiles and presents a unified discussion of various results on shell vibrations, focusing primarily on circular cylindrical shells. It compares frequencies predicted by different shell equations with those from three-dimensional elasticity and experiments, providing extensive frequency predictions for various boundary conditions. The book also briefly covers noncircular cylindrical and conical shells, but only includes a bibliography for spherical and other shells. It is recommended as a useful reference for engineers and theoreticians working with vibrating shells. **Elastic Wave Propagation** By J. D. Achenbach, published in 1973. This comprehensive monograph on elastodynamics aims to convey the fascinating aspects of wave propagation phenomena and the elegant mathematics involved. The book begins with basic concepts of one-dimensional linear waves and then delves into the mathematical foundations of linear elastodynamics, including proofs of uniqueness and dynamic reciprocal theorems. Chapters 4-9 cover various problems and classes of solutions in elastic wave theory, starting with two-dimensional antiplane strain (SH-waves) and progressing to more complex two-dimensional plane strain (P and SV-waves) models, and finally, the full three-dimensional situation. The book includes detailed treatments of steady-state harmonic wave analysis, reflection and refraction of plane waves, harmonic waves in plates and rods, transform methods, transient waves, and Wiener-Hopf methods. It concludes with introductions to thermoelastic, viscoelastic, anisotropic, and nonlinear waves. The book is highly recommended for both students and scholars in elastodynamics.