Pellucidar Series

Mining heir David Innes and his inventive friend Abner Perry use an "iron mole" to burrow 500 miles into the earth's crust -- where they discover Pellucidar, a mysterious and dangerous land, entirely enclosed within Earth's shell! (Many of the later books in this series are available at Project Gutenberg Australia.)

1 - At the Earth's Core
2 - Pellucidar

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