Titles by Clifford D. Simak marked with tag: time travel
- 1986 - Highway of Eternity
- 1978 - Mastodonia
- 1976 - Shakespeare's Planet
- 1974 - Our Children's Children
- 1973 - Cemetery World
- 1970 - The Thing in the Stone
- 1968 - The Goblin Reservation
- 1967 - Why Call Them Back from Heaven?
- 1965 - Over the River and Through the Woods
- 1951 - Time and Again
- 1940 - Sunspot Purge
- 1938 - The Loot of Time
- 1931 - The World of the Red Sun