Genres
- Biography
- British Personal narratives
- Cryptographers
- Cryptography
- English Personal narratives
- Great Britain
- Great Britain. Government Communications Headquarters
- History
- Personal narratives, British
- Personal narratives, English
- Secret service
- World War, 1939-1945
- Cryptographie
- Récits personnels britanniques
- Guerre mondiale, 1939-1945
- Service secret
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