By A Mystery Man Writer
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The Clever Cameras Used by the East German Stasi to Spy on Citizens
Even the trees are watching: collecting the Stasi's hidden cameras and secret radios - The Verge
Stasi Spy Secrets Go on Show in Berlin - The Moscow Times
The Clever Cameras Used by the East German Stasi to Spy on Citizens
German Exhibit Reveals Secret Stasi Spy Photos : The Picture Show : NPR
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Seduced by Secrets: Inside the Stasi's Spy-Tech World: Macrakis, Kristie: 9780521887472: : Books