The codebreakers
Subtitle: the secret intelligence unit that changed the course of the First World War
By: James Wyllie and Michael McKinley
Contributors: McKinley, Michael, 1961- author
Publisher: Ebury Press
Published: 2015
Place of publication: London
Language: eng
ISBN-13: 9780091957728; 9781473501461
Subjects: World War, 1914-1918; Cryptography