UFOs : true mysteries or hoaxes? - Asimov, Isaac, 1920-1992.; Walz-Chojnacki, Greg, 1954-; Asimov, Isaac, 1920-1992. (Milwaukee : G. Stevens Pub., 1995)
Rev. ed. of: Unidentified flying objects. c1988.
Includes index.
Keywords: Unidentified flying objects -- Juvenile literature