This book review covers three volumes: "Fluid Mechanics," "Rheology," and "Heat Conversion." The first volume, "Similarity and Dimensional Methods in Mechanics" by L. I. Sedov, presents a systematic method for studying nonlinear problems in fluid mechanics using dimensional analysis. It discusses the application of dimensional analysis to fluid dynamics, including shock waves and turbulence, and provides examples of self-similar solutions. The book is valuable for scientists and engineers due to its clear explanations and practical applications. The second volume, "Introduction à l'Étude de la Rééologie," edited by B. Persoz, is an introduction to rheology, covering theoretical background and practical applications of various materials. The third volume, "Direct Conversion of Heat to Electricity," edited by Joseph Kaye and J. A. Welsh, presents a collection of lectures on direct heat-to-electricity conversion, covering thermionic engines, magnetogasdynamics, thermoelectric effects, and fuel cells. The book is a useful resource for engineers and physicists interested in this field, though it is variable in quality and difficult to read in parts.This book review covers three volumes: "Fluid Mechanics," "Rheology," and "Heat Conversion." The first volume, "Similarity and Dimensional Methods in Mechanics" by L. I. Sedov, presents a systematic method for studying nonlinear problems in fluid mechanics using dimensional analysis. It discusses the application of dimensional analysis to fluid dynamics, including shock waves and turbulence, and provides examples of self-similar solutions. The book is valuable for scientists and engineers due to its clear explanations and practical applications. The second volume, "Introduction à l'Étude de la Rééologie," edited by B. Persoz, is an introduction to rheology, covering theoretical background and practical applications of various materials. The third volume, "Direct Conversion of Heat to Electricity," edited by Joseph Kaye and J. A. Welsh, presents a collection of lectures on direct heat-to-electricity conversion, covering thermionic engines, magnetogasdynamics, thermoelectric effects, and fuel cells. The book is a useful resource for engineers and physicists interested in this field, though it is variable in quality and difficult to read in parts.