by Pierre Delval · Círculo de Lectores · tapa dura · ISBN 9788467218305
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«El Gran Libro de los Ovni» is the essay on the UFO phenomenon by Pierre Delval, published by Círculo de Lectores in hardback (274 pages, in Spanish).
The book addresses the UFO phenomenon through observations and encounters, gathers cases of sightings and features the participation of the Ouranos Study Commission and a prologue by Iker Jiménez to offer an overview of research on the subject.
Published in 2006, it is a translation from the French of «Le grand livre des objets volants non identifiés»; includes bibliography and 16 illustrated plates.
