Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Australia Ltd, Ringwood, Victoria, Australia
First published by Harvard University Press 1941 Published by Pelican Books 1971 Copyright © The President and Fellows of Harvard College, 1941, 1963, 1968
Made and printed in Great Britain by Taylor Garnett Evans & Co. Ltd, Watford, Herts Set in Intertype Times
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