1. 1966 Dune by Frank Herbert

2. 1967 Babel-17 by Samuel Delaney - tie

3. 1967 Flowers for Algernon

4. 1968 Einstein Intersection by Samuel Delaney

5. 1969 Right of Passage by Alexei Panshin

6. 1970 Left Hand of Darkness by Ursula LeGuin

7. 1971 Ringworld by Larry Niven

8. 1972 Time of Changes by Robert Silverburg

9. 1973 The Gods Themselves by Isaac Asimov

10. 1974 Rendezvous with Rama by Arthur C. Clarke