Tarzan at the Earth's Core is a novel by American writer Edgar Rice Burroughs. It is the 4th book of Pellucidar Series and 13th book of Tarzan Series.

In response to a radio plea from Abner Perry, a scientist who with his friend David Innes has discovered the interior world of Pellucidar at the Earth's core, Jason Gridley launches an expedition to rescue Innes from the Korsars (corsairs), the scourge of the internal seas.

Pellucidar Series: Book # 4
Tarzan Series: Book # 13

Books in Pellucidar Series:
1. At the Earth's Core
2. Pellucidar
3. Tanar of Pellucidar
4. Tarzan At The Earth's Core
5. Back to the Stone Age
6. Land of Terror
7. Savage Pellucidar


Books in Tarzan Series:
1. Tarzan of the Apes
2. The Return of Tarzan
3. The Beasts of Tarzan
4. The Son of Tarzan
5. Tarzan and the Jewels of Opar
6. Jungle Tales of Tarzan
7. Tarzan the Untamed
8. Tarzan the Terrible
9. Tarzan and the Golden Lion
10. Tarzan and the Ant-men
11. Tarzan, Lord of the Jungle
12. Tarzan and the Lost Empire
13. Tarzan At The Earth's Core
14. Tarzan the Invincible
15. Tarzan Triumphant
16. Tarzan and the City of Gold
17. Tarzan and the Lion-Man
18. Tarzan and the Leopard Men
19. Tarzan's Quest
20. Tarzan and the Forbidden City
21. Tarzan the Magnificent (Tarzan and the Magic Men)
22. Tarzan and the Castaways
23. Tarzan and The Foreign Legion
24. The Tarzan Twins
25. Tarzan and the Tarzan Twins with Jad-bal-ja the Golden Lion


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