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OAHSPE..............................................................................................................newbrough j.b.
Obiettivo sugli UFO - fotostoria dei dischi volanti....................................................turris g., fusco s.
Objets volants non identifiés. Le plus grand problème..................................................mcdonald j.e.
Observing UFO's..........................................................................................................haines r.f.
Of no defence significance?...........................................................................................jenkins s.
On pilots and UFO's.......................................................................................................smith w.
One in fourty, the UFO epidemic................................................................................dennett p.e.
One light..................................................................................................................whistles j.
One step beyond, story of 1978 english abductee...............................................oakensen e., pope
Ontmoetingen met buitenaardse wezens........................................................................steiger b.
Ontmoetingen, contacten met buitenaardse wezens (32)..................................................mack j.e.
Ontvoerd!....................................................................................................jordan d.,mitchell k.
Open skies, closed minds................................................................................................pope n.
Operation earth................................................................................................le poer trench b.
Operation mind control................................................................................................bowart w.
Operation trojan horse (17)..............................................................................................keel j.
Operazione pleniluni......................................................................................................vesco r.
Other tongues, other flesh....................................................................................williamson g.h.
Other voices ( = The saucers speak ?)....................................................................williamson g.h.
Other wolds, other lives................................................................................................steiger b.
Our haunted planet...........................................................................................................keel j.
Our mysterious spaceship moon......................................................................................wilson d.
Our UFO visitors............................................................................................................magor j.
Out there, the gouvernements secret quest for extraterrestrials............................................blum h.
OVNI, dimension autre..............................................................................................lob j., gigi r.
OVNI, l'armée parle..................................................................................................bourret j.-c.
OVNI, nouveaux dossiers chinois........................................................................................bo shi
OVNI's, 50 ans de secret.............................................................................................bourdais g.
OVNI's, documentos officiales del gobierno espagnol.......................................................benitez j.j.
OVNI's, el fenomeno aterrizaje..........................................................................ballester olmos v.j.
OVNI's, le premier dosier complet....................................................................fiquet m., ruchon j.l.
OZN o problema moderna.........................................................................................gheorghita f.
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