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  1. History of espionage - Wikipedia

  2. Revolutionaries and spies: Spy-good and spy-bad graphs

  3. The Art of Spying: Espionage in the Modern Era - Foreign Policy

  4. INTEL - Explore the "Evolution of Espionage in America"

  5. Are Spies More Trouble Than They’re Worth? | The New Yorker

  6. ‘Spying’ -- what it is, what it isn’t and how espionage is evolving ...

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