1) Dune, Frank Herbert (1965)
2) The Left Hand of Darkness, Ursula K. Le Guin (1969)
3) Childhood's End, Arthur C. Clarke (1953)
4) The Moon is a Harsh Mistress, Robert A. Heinlein (1966)
5) Stranger in a Strange Land, Robert A. Heinlein (1961)
6) The Foundation Trilogy, Isaac Asimov (1953)
7) A Canticle for Leibowitz, Walter M. Miller Jr (1959)
8) Gateway, Frederik Pohl (1977)
9) Ringworld, Larry Niven (1970)
10) The Stars My Destination, Alfred Bester (1956)
11) Lord of Light, Roger Zelazny (1967)
12) More Than Human, Theodore Sturgeon (1953)
13) The Mote in God's Eye, Larry Niven & Jerry Pournelle (1974)
14) The Man in the High Castle, Philip K. Dick (1962)
15) The Time Machine, H. G. Wells (1895)
16) Stand on Zanzibar, John Brunner (1968)
17) The Dispossessed, Ursula K. Le Guin (1974)
18*) The Demolished Man, Alfred Bester (1953)
18*) The Forever War, Joe Haldeman (1974)
20) The Martian Chronicles, Ray Bradbury (1950)
21) Starship Troopers, Robert A. Heinlein (1959)
22) Dying Inside, Robert Silverberg (1972)
23) Dhalgren, Samuel R. Delany (1975)
24) Time Enough for Love, Robert A. Heinlein (1973)
25*) Way Station, Clifford D. Simak (1963)
25*) Rendezvous with Rama, Arthur C. Clarke (1973)
27) To Your Scattered Bodies Go, Philip Jose Farmer (1971)
28) Earth Abides, George R. Stewart (1949)
29) The Door Into Summer, Robert A. Heinlein (1957)
30) City, Clifford D. Simak (1952)
31) The Witches of Karres, James H. Schmitz (1966)
32) The City and the Stars, Arthur C. Clarke (1956)
33) The Caves of Steel, Isaac Asimov (1953)
34) 1984, George Orwell (1949)
35) Norstrilia, Cordwainer Smith (1975)
36) Mission of Gravity, Hal Clement (1954)
37) Ubik, Philip K. Dick (1969)
38*) Timescape, Gregory Benford (1980)
38*) 2001: A Space Odyssey, Arthur C. Clarke (1968)
40) Fahrenheit 451, Ray Bradbury (1953)
41) Downbelow Station, C. J. Cherryh (1981)
42) The War of the Worlds, H. G. Wells (1898)
43) Last and First Men, Olaf Stapledon (1930)
44) Double Star, Robert A. Heinlein (1956)
45) Davy, Edgar Pangborn (1964)