Pellucidar
1 At the Earth's Core (1922)
2 Pellucidar (1923)
3 Tanar of Pellucidar (1929)
4 Tarzan at the Earth's Core (1930)
5 Back to the Stone Age (1937)
6 Land of Terror (1944)
7 Savage Pellucidar (1941)
2 Pellucidar (1923)
3 Tanar of Pellucidar (1929)
4 Tarzan at the Earth's Core (1930)
5 Back to the Stone Age (1937)
6 Land of Terror (1944)
7 Savage Pellucidar (1941)
