"Extraterrestres Novela." . . . "Fiction" . . . . . . . . . "Objetivo: la tierra"@es . "Science fiction" . . "Target--earth" . . "Alone on a secluded lake, the reader encounters alien construction workers at work on an anti-gravity building site. The reader's choices determine the outcome of the plot." . . "Juvenile works" . "Objetivo-- la tierra" . . . . . . . "Determine el final de sus cuentos." . . . . "Cuentos de aventuras." . .