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Materials in non-English languages
Ribera, Antonio: El Gran enigma de los platillos volantes
1974, Plaza & Janes, Barcelona
Paperback, 564 pages, ill., bibl.
Orig: Objetos desconocidos en el cielo, publ. 1961
1966, Editorial Pomaire, Barcelona
Hardcover,435 pages, ill., bibl
Paperback, 564 pages, ill., bibl.
Orig: Objetos desconocidos en el cielo, publ. 1961
1966, Editorial Pomaire, Barcelona
Hardcover,435 pages, ill., bibl