Missing Men of Saturn by Philip Latham—A space crew is held prisoner by froglike men on Saturn
Mission to the Moon by Lester del Rey—Scientists make man's first journey to the Moon
Mists of Dawn by Chad Oliver—A space-time machine hurls a 20th-century boy back to 50,000 B. C.
Mysterious Planet, The by Kenneth Wright—A young captive on Planet X prevents Earth's destruction
Mystery of the Third Mine by Rob. Lowndes—Prospecting in the dangerous Asteroid belt
Planet of Light by Raymond F. Jones—A trip to another planet shows how the Universe can be saved from destruction
Rocket Jockey by Philip St. John—A space pilot battles Martians in rocket race
Rocket to Luna by Richard Marsten—A stowaway on a Moon-bound rocket proves his worth
Rockets to Nowhere by Philip St. John—Scientists establish a colony on the Moon
Secret of Saturn's Rings, The by Donald A. Wollheim—A scientist proves his theories by means of a unique invention