. . "Unidentified flying objects Juvenile literature." . . "Unidentified flying objects." . . "UFOs" . . . . . "Juvenile works" . . . . . . . . . . . "A brief examination in text and illustration of reports of UFO sightings with some possible explanations about the origin and purpose of these mysterious objects." . . . "A brief examination in text and illustration of reports of UFO sightings with some possible explanations about the origin and purpose of these mysterious objects."@en . "Exploring UFOs" . "UFOs"@en .