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Hollow Nickel/Rudolf Abel — FBI
Hollow Nickel Case - Wikipedia
How a Nickel and a Paperboy Brought Down a Cold War Spy
Relive the Cold War with Hollow Spy Coins - ITS Tactical
Spy-Coins
A Byte Out of History - Hollow Nickel - FBI
Rudolf Abel and the Hollow Nickel Case — FBI
Cold War Close-up: KGB Spy Tools - Richard Nixon Foundation
Hollow Coins - International Spy Museum
Hollow Spy Coins - YouTube