SECRET OF SATURN'S RINGS, THE by Donald A. Wollheim—A scientist proves his theories by means of a unique invention
SECRET OF THE MARTIAN MOONS, THE by Donald A. Wollheim—Scientists discover the secrets of Martian civilization
SON OF THE STARS by Raymond F. Jones—An interplanetary friendship brings Earth to the brink of destruction
SONS OF THE OCEAN DEEPS by Bryce Walton—Undersea terrors nearly thwart a project aimed at saving a continent
STAR CONQUERORS, THE by Ben Bova—The Terran Confederation battles for its existence against the all-powerful rulers of the Milky Way Galaxy
STAR SEEKERS, THE by Milton Lesser—A tale of a spaceship doomed to crash
STEP TO THE STARS by Lester del Rey—The U. S. builds a space station
TROUBLE ON TITAN by Alan E. Nourse—A rocket experimenter discovers a plot threatening Earth's existence
VANDALS OF THE VOID by Jack Vance—A tale of space pirates
VAULT OF THE AGES by Poul Anderson—Life 500 years after the flaming collapse of 20th-century civilization