by Donald E. Keyhoe · tapa dura · ISBN 9788422611585
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«Los desconocidos del espacio» is Donald E. Keyhoe's essay on ufology, published by Círculo de Lectores in hardcover (358 pages, in Spanish).
Donald E. Keyhoe, an officer of the United States Navy Air Force, authors this work on ufology about the phenomenon of unidentified flying objects. The author analyzes the mystery surrounding UFOs and defends the importance of investigating them.
1980 edition published in Barcelona, with translation by Sebastián Martínez and Luis Vigil; the book measures 20 x 13 cm.
For those interested in ufology, UFOs and paranormal phenomena, with a non-fiction treatment.
