Tarzan at the Earth's core
Tarzan the invincible
Tarzan triumphant
Tarzan and the city of gold
Tarzan and the lion man
Tarzan and the leopard men.
Tarzan at the Earth's core and other tales by Edgar Rice Burroughs. ISBN 9780575129184. Published by Gollancz in 2014. Publication and catalogue information, links to buy online and reader comments.