The Secret of Saturn's Rings
Donald A. Wollheim
The Ant Men
Eric North
Secret of the Martian Moons
The Lost Planet
Paul Dallas
The Year When Stardust Fell
Raymond F. Jones
The Secret of the Ninth Planet
Stadium Beyond the Stars
Milton Lesser
Lost Race of Mars
Robert Silverberg
Step to the Stars
Lester Del Rey
Jim Stanley (1)
Mission to the Moon
Jim Stanley (2)
Son of the Stars
Ron Barron (1)
Planet of Light
Ron Barron (2)
The Star Conquerors
Ben Bova
Star Watch / Watchmen (1)