Penguin Books Ltd, Harmondsworth, Middlesex
U.S.A.: Penguin Books Inc, 3300 Clipper Mill Road, Baltimore 11, Md
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road,
Mitcham, Victoria
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First published 1953
Reprinted 1954
Reprinted with revisions 1957
New edition 1959
Made and Printed in Great Britain by Richard Clay & Company Ltd, Bungay, Suffolk