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    Encyclopdia Britannica, Inc.www.britannica.com

    First print edition published in the UK by Robinson,an imprint of Constable & Robinson Ltd, 2008

    Text 2008 Encyclopdia Britannica, Inc.Introduction 2008 Robert M. May

    The right of Encyclopdia Britannica, Inc. and Robert M. May to be identified as theauthors of this work has been asserted by them in accordance

    with the Copyright, Designs & Patents Act, 1988.

    Britannica, Encyclopdia Britannica, and the Thistle logoare registered trademarks of Encyclopdia Britannica, Inc.

    This eBook edition published by Encyclopdia Britannica, Inc.

    ISBN 978-1-59339-848-4

    No part of this work may be produced or utilized in any form or by any means,

    electronic or mechanical, including photocopying, recording, or by any informationstorage and retrieval system, without permission in writing from the publisher.

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