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Acknowledgments The author wishes to thank those at the Catholic University of America Press (David McGonagle, James Kruggel, Greg LaNave, Theresa Walker, and Beth Benevides) who encouraged and assisted this project through its various stages. Acknowledgment also is due to four readers for the Press (Raymond Dennehy, Steven C. Snyder, Michael W. Tkacz, and one anonymous reader), who made a number of helpful suggestions. The contributions of Steven Snyder deserve special mention . I of course am responsible for errors and infelicities that remain. I wish to thank as well Andy Jaspers, S.J., who assisted in the preparation of figures and tables, and Ellen Coughlin, who expertly copyedited the manuscript. My students across the years—to whom this book is dedicated— have been a source of steady encouragement; and they have helped in many ways to make a challenging text more reader-friendly. Finally, I thank my family, and especially my dear wife, Chris, whose unflagging support now at last is rewarded. Omaha, Nebraska June 2007 ix ...

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