Bletchley Park's Secret Room: The Centre of Britain's Wartime Code-Breaking
UK: Amberley, 2015. Paperback. New softcover in printed covers. 8vo. (4.88 x 0.5 x 7.8 inches) Clean text free of marks or underlining. B&W photos & illustrations. Includes a glossary and bibliography. 176 pp. Fast shipping in a secure book box mailer with tracking. In 1940 a small band.....