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INTELLIGENCE SOURCES: Tools of Modern Espionage (Intelligence and Counterintelligence Manuals) INTELLIGENCE SOURCES: Tools of Modern Espionage (Intelligence and Counterintelligence Manuals) Independently published 
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On Intelligence: The History of Espionage and the Secret World Constable RobinsonBibliologica Press 
Espionage Black Book Ten: Foundations of Intelligence Explained Routledge 
Intelligence And Espionage: An Analytical Bibliography Oxford University Press 
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