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I am grateful to many persons for helpful suggestions and criticisms in connection with this book, especially to Professor Killis Campbell, of the University of Texas, who read a large portion of my manuscript at an early stage in its preparation; to Professor Howard M. Jones, of the University of North Carolina, who examined the manuscript at a time of unusual stress; to my colleague, Professor Laurens J. Mills, who has read all the proofs; and to my wife, who has read and reread both manuscript and proofs.

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