Estar Books: 532 books

Back in the dim dawn of civilization Anak the Hunter stands in his might before the encroaching Neanderthal men.

Another episode in Dr. Bird's long scientific duel with his country's arch-enemy Saranoff.

Marian was missing and Bert was determined to find her! He never expected it would lead him to a mysterious barrier and interplanetary intrigue.

One after another the invisible robots escape Shelton's controland their trail leads straight to the gangster chief Cadorna.

Plucked from the space-lanes by its ravening magnetism, the two intrepid Terrans defied the death of this deadly radioactive worldlet by playing games with the roly-poly natives!

The human race faces extinction unless Earthmen can find mates on Mars!

Vivienne Lenglet’s hand fluttered to the delectable region of her heart. Shocked reproach stole into her voice. “Mais— but Hectoire—surely you wouldn’t ask me, your own wife, to…?”

Five millenniums have passed since the loathsome Termans were eliminated from the world of Diskra.... But what of the other planets?

Fate throws two young Earthians into desperate conflict with the primeval monsters of an electron's savage jungles

Trant substituted for the photograph the bend wire given to him by Miss Rowan. Then for the last time he swung to the instrument and his eyes caught the wildly vibrating pencils, they flared with triumph.

There was something strange about Jupe. Was he really of Jupiter? But the oddest thing was the uncanny way he could compute weights even the weight of Death

This globe deep in the earth and the girl who had slept centuries was the only hope against the Borers

Join Haskel van Manderpootz and Dixon Wells in another adventure! Wells explores the world of of if's, time travel, and missed opportunities.