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Return to the stars

Zuruck zu den Sternen

Vizitatori din timp

The flying saucer reader

Lumi galactice

Marile enigme

Kreisrunde zeichen

Les Paraterrestres

UFO tortenelem

Das Erlebnis und die Dichtung

Sind vir allein?

Astralii din Atlantida

Astralii în orientul antic

Cosmic Continents

Extraterrestri nell antico oriente

Gli extraterrestri e le civilta scomparse

Gods and spacemen in Greece and Rome

Gods and spacemen in Israel

Gods and spacemen in the Ancient East

Gods and spacemen in the Ancient West