ts find living fossils in the
badlands of Central Australia_

Attack from Atlantis by Lester del Rey--_An atomic submarine crew
discovers the lost city of Atlantis_

Battle on Mercury by Erik Van Lhin--_Sun storms sweep Mercury and
threaten man's existence_

Danger: Dinosaurs! by Richard Marsten--_A treacherous big-game hunter
leads an expedition back to the Age of Reptiles_

Earthbound by Milton Lesser--_An ex-space cadet is forced to plunder
ships he was trained to protect_

Find the Feathered Serpent by Evan Hunter--_Explorers in Mexico discover
startling Mayan remains_

Five Against Venus by Philip Latham--_A Moon-bound rocket crashes in the
misty wilds of Venus_

Islands in the Sky by Arthur C. Clarke--_A teen-ager's adventures aboard
a space station_

Lost Planet, The by Paul Dallas--_Two worlds on the verge of war_

Marooned on Mars by Lester del Rey--_A teen-ager on the first
Moon-to-Mars expedition_

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_

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 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 roc