- Ufo's True Mysteries or Hoaxes (Isaac Asimov's New Library of the Universe)
- The Birth of Our Universe (Isaac Asimov's New Library of the Universe)
- Space Colonies (Isaac Asimov's New Library of the Universe)
- Celestial Delights: The Best Astronomical Events Through 2001
- The 21st Century in Space (Isaac Asimov's New Library of the Universe)