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First published 1950
This edition first published in Penguin Classics 2010
Reprinted with corrections 2013
Editorial material copyright © Gordon Turnbull, 2010
Cover: Detail from View of Covent Garden with St. Paul’s Church, (c.1750) by Balthasar Nebot © Tate, London
All rights reserved
The moral right of the editor has been asserted
ISBN: 978-0-241-21545-6