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Espionage | international relations | Britannica
Espionage - Wikipedia
Espionage Definition & Meaning - Merriam-Webster
ESPIONAGE | English meaning - Cambridge Dictionary
Espionage Facts | International Spy Museum
INTEL - Evolution of Espionage - Intelligence
History of espionage - Wikipedia
Counterintelligence — FBI
Espionage - The New York Times
What to read to understand intelligence and espionage - The Economist