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In 1939–45 signals intelligence warfare was of far greater importance than it had ever been before and overshadowed human intelligence, the work of spies. Nevertheless, there were subjects that signals ...

Subjects: History — Military History

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Reference entries
espionage
in Encyclopaedic Dictionary of International Law (3) Length: 88 words
espionage
in The Oxford Essential Dictionary of the U.S. Military Length: 42 words
Espionage, Economic and Industrial
in The Oxford Encyclopedia of Economic History Length: 1417 words
Intelligence Gathering and Espionage.
in The Oxford Companion to United States History Length: 1010 words

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