Pellucidar (Ace #65851) (Inner Earth Series #2)

Pellucidar (Ace F-158)
David Innes and Abner Perry discovered a pre-historic world at the earth's core, and it was inhabited by cavemen, prehistoric creatures, and humanoid races. In this book from the series, David Innes is returning to Pellucidar with modern marvels to help in the war of the federated tribes against the vicious Mahar and the Sagoths.Keywords: FANTASY