Action & Adventure

Asteroid of Fear

The Syndic

Alien Minds

Off on a Comet! a Journey through Planetary Space

Badge of Infamy

The Black Opal (Serapis Classics)

City of Endless Night

Butterfly 9

The Call of the Savage (Serapis Classics)

The Highest Treason

Founding Father

The Variable Man

A Queen of Atlantis (Serapis Classics)

End as a Hero

Unwise Child

But, I Don't Think

Pellucidar (Serapis Classics)

Whisper

People of the Sky

Intangibles, Inc