Tarzan

There are more than these, though.

1. Tarzan of the Apes
2. The Return Of Tarzan
3. ?
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 Earths Core
14. Tarzan the Invincible

• Jungle Tales Of Tarzan by Edgar Rice Burroughs (SF)
• Return Of Tarzan by Edgar Rice Burroughs (SF)
• Son Of Tarzan by Edgar Rice Burroughs (SF)
• Tarzan And The Ant Men by Edgar Rice Burroughs (SF)
• Tarzan And The Golden Lion by Edgar Rice Burroughs (SF)
• Tarzan And The Jewels Of Opar by Edgar Rice Burroughs (SF)
• Tarzan And The Lost Empire by Edgar Rice Burroughs (SF)
• Tarzan At The Earths Core by Edgar Rice Burroughs (SF)
  This one was a sort of crossover between Tarzan and Burroughs' "Earth's Core" universe.
• Tarzan Lord Of The Jungle by Edgar Rice Burroughs (SF)
• Tarzan Of The Apes by Edgar Rice Burroughs (SF)
  The one that started it all.
• Tarzan The Invincible by Edgar Rice Burroughs (SF)
• Tarzan The Terrible by Edgar Rice Burroughs (SF)
• Tarzan The Untamed by Edgar Rice Burroughs (SF)