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Avistamientos OvnisZeidman,UFO-Helicopter 1973,Ohio,FSR77V23N4
Zeidman,UFO-Helicopter 1973,Ohio,FSR77V23N4
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UfologíaZhuravlev,UFOs and Abductions in the USSR,FSR2002V47N1
Zhuravlev,UFOs and Abductions in the USSR,FSR2002V47N1
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UfologíaZimmer,Alien Earth study programme,FSR76V22N5
Zimmer,Alien Earth study programme,FSR76V22N5
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UfologíaZinsstag,Conversations with Dr.Jung,FSR63V9N4
Zinsstag,Conversations with Dr.Jung,FSR63V9N4
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UfologíaZinsstag,Lou 1905-1984,Timothy Good,FSR1984V29N4
Zinsstag,Lou 1905-1984,Timothy Good,FSR1984V29N4
