City
Clifford D. Simak
Mass Market Paperback
(Ace Books, March 15, 1976)
A masterful tale of an Earth overrun by ants, a series of parallel worlds ruled by dogs, and a Jupiter where the human race finds its Golden Age-if human it could still be called. "This strange and fascinating story of the future of man describes a tomorrow that is completely enthralling." -Galaxy "A high-water mark in science fiction writing." -Anthony Boucher