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Subject
- History3
- Cryptography2
- Espionage, Soviet2
- Foreign relations2
- Sources2
- United States2
- Diplomatic relations1
- Regimental histories1
- Soviet Union1
- Soviet Union / Glavnoe razvedyvatelʹnoe upravlenie1
- Soviet Union / Komitet gosudarstvennoĭ bezopasnosti1
- Soviet Union. Glavnoe razvedyvatelʹnoe upravlenie1
- Soviet Union. Komitet gosudarstvennoĭ bezopasnosti1
- United States / Signal Security Agency1
- United States. Signal Security Agency1
- World War, 1914-19181