Orphans of the Sky
by Robert A. Heinlein | 
Outward Bound
by Robert A. Heinlein | 
Off the Main Sequence
by Robert A. Heinlein | 
The Day After Tomorrow
by Robert A. Heinlein | 
Beyond This Horizon
by Robert A. Heinlein | 
I Will Fear No Evil
by Robert A. Heinlein | 
Methuselah's Children
by Robert A. Heinlein | 
For Us, the Living
by Robert A. Heinlein | 
The Integral Trees
by Larry Niven | 
Starman Jones
by Robert A. Heinlein | 
Slan
by A. E. van Vogt | 
Imperial Earth
by Arthur C. Clarke | 
A World Out of Time
by Larry Niven | 
Whipping Star
by Frank Herbert | 
Between Planets
by Robert A. Heinlein | 
Beowulf's Children
by Larry Niven | 
Queen of Angels
by Greg Bear | 
Destiny's Road
by Larry Niven | 
Contact
by Carl Sagan | 
Solaris
by Stanislaw Lem |
One by one, the Free Nations had fallen, until finally America too was under the heel of the invader. Now the only hope resides in a mountain redoubt where six men work in secret on a plan to rock the planet. . . .