The Journal of Applied Mechanics features book reviews on topics such as viscoelasticity, hydrodynamics, elasticity, and radioisotopes. The first review discusses "Mechanics of Incremental Deformation" by M. A. Biot, which presents an intermediate theory between formal mathematical approaches and engineering practice. The book extends methods from "strength of materials" to three dimensions, using suffix notation and Cartesian tensors. It covers areas like rubber elasticity and tectonic folding. The text emphasizes variational methods and virtual work principles. The second review covers "Hydrodynamics in Theory and Application" by J. M. Robertson, which studies incompressible, inviscid fluid flow. The book is structured into three parts, including numerical and analog methods. It is suitable for graduate students and includes historical context and references. The text uses vector notation and provides multiple derivations of results. The third review discusses "Elasticity in Engineering Mechanics" by A. P. Boresi, which combines theory and application. The book develops continuum mechanics theory and covers plane problems, torsion, and thermal stress analysis. It includes mathematical summaries and classical solutions, but lacks discussion on solution interpretations. The final review is on "Radioisotopic Power Generation" by W. R. Corliss and D. G. Harvey, which reviews the U.S. government's radioisotope power generator program. The book discusses the use of radioisotopes for power generation, safety issues, and the limited commercial applications of such systems. It includes detailed descriptions of various generator types and their uses in space and defense. The book is well-organized and informative, providing a comprehensive overview of the field.The Journal of Applied Mechanics features book reviews on topics such as viscoelasticity, hydrodynamics, elasticity, and radioisotopes. The first review discusses "Mechanics of Incremental Deformation" by M. A. Biot, which presents an intermediate theory between formal mathematical approaches and engineering practice. The book extends methods from "strength of materials" to three dimensions, using suffix notation and Cartesian tensors. It covers areas like rubber elasticity and tectonic folding. The text emphasizes variational methods and virtual work principles. The second review covers "Hydrodynamics in Theory and Application" by J. M. Robertson, which studies incompressible, inviscid fluid flow. The book is structured into three parts, including numerical and analog methods. It is suitable for graduate students and includes historical context and references. The text uses vector notation and provides multiple derivations of results. The third review discusses "Elasticity in Engineering Mechanics" by A. P. Boresi, which combines theory and application. The book develops continuum mechanics theory and covers plane problems, torsion, and thermal stress analysis. It includes mathematical summaries and classical solutions, but lacks discussion on solution interpretations. The final review is on "Radioisotopic Power Generation" by W. R. Corliss and D. G. Harvey, which reviews the U.S. government's radioisotope power generator program. The book discusses the use of radioisotopes for power generation, safety issues, and the limited commercial applications of such systems. It includes detailed descriptions of various generator types and their uses in space and defense. The book is well-organized and informative, providing a comprehensive overview of the field.