`For an introduction to the field, it is the choice to read - either from cover to cover or as a long-term reference. The author has done an excellent job in reducing the enormous wealth of experimental results, sometimes apparently contradictory to the essentials. For the newcomer to the field it provides an introduction and a gateway to the current literature; for the beginning graduate student it provides a broad, unintimidating survey; for the expert who is momentarily overwhelmed by the volume of available data, it provides a distillation, to allow a regrouping before a renewed attack on the original literature.' Physics Today, December 1995`This book is an important extension of earlier publications on the topic involving extremely low temperatures. This work provides the first complete account of the astonishing properties of the crystals of solid helium three ... will be found to be very useful and suitable for research staff and students in physics and physical chemistry with an interest in current developments in this field.' W Steckelmacher, University of Sussex, Vacuum/volume 46/number 1/1995