found: Work cat.: The thing from another world, 1987, c1951(Arctic researchers discover a huge, frozen alien inside a crash-landed UFO)
found: Hennepin(Aliens (Humanoid), Aliens (Non-humanoid))
found: Am. heritage dict.(extraterrestrial: an extraterrestrial being or life form)
found: Drake, F.D. Is any one out there? : the scientific search for extraterrestrial intelligence, 1992.
found: LC database, Jan. 12, 2007(in titles: Alien beings; extraterrestrials; extraterrestrial beings)
found: Encarta world Eng. dict.(alien : Extraterrestrial being : a being from another planet or another part of the universe, esp. in works of science fiction)