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Blackwell Science

© G. N. Smith 1968, 1971, 1974, 1978, 1982, 1990, 1988

Blackwell Science Ltd Editorial Offices: Osney Mead, Oxford OX2 OEL 25 John Street, London WC1N 2BL 23 Ainslie Place, Edinburgh EH3 6AJ 350 Main Street, Maiden MA 02148 5018, USA 54 University Street, Carlton

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The right of the Author to be identified as the Author of this Work has been asserted in accordance with the Copyright, Designs and Patents Act 1988.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mcchanical, photocopying, recording or otherwise, except as permitted by the UK Copyright, Designs and Patents Act 1988, without prior permission of the publisher.

First published by Crosby Lockwood & Son Ltd 1968

Second edition 1971

Third edition published by Crosby Lockwood Staples

1974 Reprinted 1975 Fourth edition 1978 Reprinted in paperback 1978 Reprinted by Granada Publishing 1979, 1981 Fifth edition 1982 Reprinted 1983, 1984

Reprinted by Collins Professional and Technical Books 1987

Sixth edition published by BSP Professional Books 1990

Reprinted by Blackwell Science 1990, 1992, 1993, 1994, 1995

Seventh edition published by Blackwell Science 1998

Set in 10/12 pt Times by Aarontype Limited, Bristol Printed and bound in Great Britain at the University Press, Cambridge

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