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This book should serve as an admirable introductory text: it is very well written and organized and the approach adopted is sound. Nowadays, when a book on servomechanism theory appears almost monthly, one has misgivings at the publication of yet another one, particularly as many of the American texts are practically indistinguishable from each other. However, the book under review has a character of its own, which would make it form a suitable basis for a university course.