Penguin Books Ltd, Harmondsworth, Middlesex
Australia: Penguin Books Pty Ltd, 762 Whitehorse Road,
Mitcham, Victoria
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First published by 1938
Published in Great Britain by Routledge and Kegan Pau 1950
Published in Penguin Books 1958
Made and printed in Great Britain by Hunt, Barnard & Co. Ltd., Aylesbury