in nonadiabatic collisions by quantum-mechanical calcula­ tion as can be seen from the many quotations in the chapter on relaxation processes in shock waves. Finally, Yeo V. Stupochenko's heavy contribution to the development of the study of nonequilibrium gas flow must also be mentioned, as it is obviously reflected at various places throughout the book. It is worth particular mention that the authors have compiled the most extensive bibliography of references (over six hundred in total) in the litera­ ture of relaxation gasdynamics to date. The authors' thorough familiarity with the Western (particularly American) work in this ,!rea can be seen from the many Western reference"~quoted, about two-thirds of the total number. On the contrary, most of the more than two hundred Russian references are not popularly known in the West and, therefore, should be of value to the English- speaking readers.