ALASTAIR DENNISTON:
Code-Breaking From room 40 to Berkeley street and the Birth of GCHQ
First published in 2017 by Frontline Books,
an imprint of Pen & Sword Books Ltd,
47 Church Street, Barnsley, S. Yorkshire, S70 2AS
Copyright © Joel Greenberg, 2017
The right of Joel Greenberg to be identified as the author of this work has been asserted by him in accordance with the Copyright, Designs and Patents Act 1988.
ISBN: 978-1-52670-912-7
eISBN: 978-1-52670-914-1
Mobi ISBN: 978-1-52670-913-4
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