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They found themselves in a prehistoric land—thousands of miles underground.
When David Innes and his inventor friend pierced the crust of the Earth in their new burrowing device, they broke into a strange new inner world of eternal daylight where prehistoric monsters still lived and cave men and women battled against cruel, inhuman masters.
The story of what these two men did in that new world of Pellucidar makes At the Earth's Core one of Burroughs' most outstanding bestsellers.