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ACKNOWLEDGMENTS xi

whom collaboration has been so stimulating over my wife Dorothy for her unfailing tolerance and
the years, especially Stephen Sparks, James Head, support.
Peter Mouginis-Mark and, of course, my co-author
Elisabeth Parfitt. Thanks for logistic help in locating Both: We wish to thank John Guest, Michael
and manipulating images go to Peter Neivert at Branney and Tracy Gregg for their helpful com-
Brown University and Ian Edmondson at Lancaster ments on parts of this book; as ever, errors and
University. Last, but very much not least, thanks to omissions remain our responsibility.