Gauge invariance theory and the development of ideas from it over the past half century are explored by US physicists in 19 papers, a few of which have been published elsewhere. Among the areas they consider are breaking the symmetry, towards the standard model, renormalization, asymptotic freedom, quark confinement and strings, the lattice, confrontation with experiments, and supersymmetry and supergravity. There is no index. Annotation ©2004 Book News, Inc., Portland, OR (booknews.com)