Pellucidar at the Earth's Core by Dark Horse

In a story originally conceived of by Edgar Rice Burroughs, a group of explorers find a land inhabited by prehistoric reptiles, strange creatures, and beings enacting dark rituals. But most importantly, they discover the beautiful Dian, queen of Pellucidar, who captures their hearts and leads them on a wild adventure to aid her and win her trust. This collects selected stories previously published in Korak, Son of Tarzan #1 and Weird Worlds #1–#7 from DC Comics.

Cover by Mark Schultz! (Xenozoic Tales/Cadillacs & Dinosaurs).

From Dark Horse Comics