The Fallible Fiend (Novarian, #2)

L. Sprague de Camp

Lest Darkness Fall

L. Sprague de Camp

The Warrior of World's End (Gondwane Epic, Bk. 1)

Lin Carter

Giant of World's End

Lin Carter

Carson of Venus (Venus, #3)

Edgar Rice Burroughs

Lost on Venus (Venus, #2)

Edgar Rice Burroughs

Pirates of Venus (Venus, #1)

Edgar Rice Burroughs

Llana of Gathol (Barsoom, #10)

Edgar Rice Burroughs

Synthetic Men of Mars (Barsoom, #9)

Edgar Rice Burroughs

Swords of Mars (Barsoom, #8)

Edgar Rice Burroughs

A Fighting Man of Mars (Barsoom, #7)

Edgar Rice Burroughs

The Master Mind of Mars (Barsoom #6)

Edgar Rice Burroughs

The Chessmen of Mars (Barsoom #5)

Edgar Rice Burroughs

Thuvia, Maid of Mars (Barsoom, #4)

Edgar Rice Burroughs

The Warlord of Mars (Barsoom, #3)

Edgar Rice Burroughs

The Gods of Mars (Barsoom #2)

Edgar Rice Burroughs

A Princess of Mars (Barsoom, #1)

Edgar Rice Burroughs

Savage Pellucidar (Pellucidar, #7)

Edgar Rice Burroughs

Land of Terror (Pellucidar, #6)

Edgar Rice Burroughs

Back to the Stone Age (Pellucidar, #5)

Edgar Rice Burroughs

Tarzan at the Earth's Core (Tarzan, #13; Pellucidar, #4)

Edgar Rice Burroughs

Tanar of Pellucidar

Edgar Rice Burroughs

Pellucidar

Edgar Rice Burroughs

At the Earth's Core

Edgar Rice Burroughs

Three Hearts and Three Lions

Poul Anderson

The Face In The Frost

John Bellairs

The High Crusade

Poul Anderson

The Broken Sword

Poul Anderson