I should like to express my gratitude to people who have helped me in the preparation of this book; Barry Cunliffe, Jen Delyth, Nick Griffiths, Betty Naggar, Alison Taylor and David Wilkinson for providing illustrations; Annie Grant, David Keys and Patrice Meniel, for information; Stephen Green, for reading and commenting on the manuscript; Kath Grace, for typing the book; Paul Jenkins, for drawing most of the illustrations. To you all, many thanks.

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