Passport to treason : the inside story of spies in America /

Eitemau Tebyg

• The world's greatest spies.
  gan: Singer, Kurt, 1911-
  Cyhoeddwyd: (1955)
• Underground diplomacy; adventures of a private spy.
  gan: Kaledin, Victor K.
  Cyhoeddwyd: (1938)
• Four spies speak /
  gan: Ecke, Heinz
  Cyhoeddwyd: (1933)
• Modern spies tell their stories : personal narratives of many exploits in secret service /
  Cyhoeddwyd: (1934)
• Spying still goes on : four spies speak / compiled by H. Ecke, foreword by Richard W. Rowan. Translated from the German.
  gan: Ecke, H.