The Skynappers / The Weapon Makers

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Human fuses for a galactic explosion

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Worlds of the Imperium

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Worlds of the Imperium, Ace Double paperback #F-127
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His deadliest foe was his own Alternate World self

This entire novel can be downloaded here

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Guardian Of The Crystal Gate

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Robert Silverberg actually wrote Guardian Of The Crystal Gate based on this cover.

“In fact, after I had been part of his staff for six months or so, he paid me the considerable compliment of asking me to write a story around a cover painting that Ed Valigursky, one of his best artists, had just brought in.
The painting showed two attractive young ladies in short tunics fiercely wrestling atop a huge diamond.”

You can read the whole thing here

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The Mars Monopoly

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Find your future in the sky — by permission of The Mars Monopoly

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To The Tombaugh Station

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Was His Spaceship Haunted — or Only Booby-Trapped?

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City Under The Sea (1957)

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They built an empire beneath the ocean

Unrelated to the story published in Fantastic Adventures

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