Pellucidar
Edgar Rice Burroughs
Pellucidar (2)
Land of Terror
Pellucidar (6)
Tanar of Pellucidar
Pellucidar (3)
Back to the Stone Age
Pellucidar (5)
At the Earth's Core
Pellucidar (1)
Savage Pellucidar
Pellucidar (7)