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1989 1st ed, Skillen, Hardback, H.C.B.Skillen.550pp +3 appendices, Illustrated with b/w photographs, maps and diagrams.
NEAR FINE Minor shelf wear to jacket, Interior excellent clean, unmarked, unfaded, as new.
The story of the 'Y' sections, the military front line of the signals intelligence war waged by Bletchley Park during WWII.
ISBN: 095151900X
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