How the idea moved: 4 landmark works

1. 1915The Thirty-Nine StepsJohn BuchanEvolutionNovel

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2. 1974Three Days of the CondorJames GradyEvolutionNovel

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3. 1980The Bourne IdentityRobert LudlumOriginNovel

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4. 2003The Da Vinci CodeDan BrownEvolutionNovel

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