The Prince of Peril

The Port of Peril

Maza of the Moon

The Call of the Savage

The Metal Monster

The Call of the Savage (Serapis Classics)

The Outlaws of Mars

The Swordsman of Mars

The Call of the Savage

The Port of Peril

The Swordsman of Mars

Maza of the Moon

The Outlaws of Mars

The Greatest Sci-Fi & Fantasy Works of Otis Adelbert Kline - 16 Books in One Edition: Time Travel Adventures, Sword & Sorcery Tales & Space Fantasies: The Complete Venus Trilogy, The Swordsman of Mars, The Outlaws of Mars, Maza of the Moon, The Metal Monster, The Revenge of the Robot…

The Venus Trilogy - Complete Sci-Fi Series: Planet of Peril, Prince of Peril & Port of Peril: Space Adventure Novels

The Swordsman of Mars

THE SWORDSMAN OF MARS & Its Sequel, The Outlaws of Mars: Sword & Sorcery Adventure Novels set on an Ancient Mars

The Prince of Peril

THE VENUS TRILOGY: The Planet of Peril, The Prince of Peril & The Port of Peril: Space Adventure Novels