Alien Encounters (The unexplained) - Tapa blanda

Do you think something's out there--a creature from another planet, perhaps? Read about those who encountered something strange and lived to tell the tale--or disappeared forever. Return to Roswell, New Mexico, half a century after an alien spaceship supposedly crashed there. Was it a UFO or just military experiments? Then move on and examine reports of other possible alien encounters, such as: * the fiery blast over the Tunguska region of Siberia--meteorite, comet or alien spacecraft? * the puzzling disappearance of pilot Frederick Valentich after he sighted a strange aircraft...* the mysterious air ships seen flying over Belgium by thousands of people, at incredible speeds. You'll wonder...Are we really alone in the universe? 48 pages (all in color), 5 1/2 x 8. NEW IN PAPERBACK