Acknowledgements

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The author is greatly indebted to Mr John W. Wilesmith for making available a large amount of unpublished information and for supplying some of the figures; to Gerald A.H. Wells for providing original photographs; and to both gentlemen for invaluable criticism of the manuscript. The author is also grateful to the Animal Health and Veterinary Group at MAFF, Tolworth for constructive comments and for checking the accuracy of the references to legislation.


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