Ferdinand Heller

References

Robert Lamphere and Tom Shachtman, ''The FBI-KGB War: A Special Agent's Story'', New York: Random House, (1995), 143, 164–165, 171.

John Earl Haynes and Harvey Klehr, ''Venona: Decoding Soviet Espionage in America'', Yale University Press (1999), pgs. 375, 469.

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