2" non-yellowing library tape reinforcing spine. Spine is flat with mild tilt: 1/16" to 1/8"

This was a Hugo-nominee in 1962. Cover art is cropped differently and reduced in size, compared to the 1961 first pb.

Long after a nuclear holocaust, the survivors' descendents live sightless far underground. One man defies the rule of his elders in search for the truth to his past. Jared faces severe penalties, but his desire for knowledge surpasses any punishment he might receive... [Dark Universe was a Hugo nominee in 1962.]