At the Earth’s Core by Edgar Rice Burroughs. New York, Ace Books, [1962]. Cover art by Roy Krenkel, Jr.
Tarzan and the Lost Empire by Edgar Rice Burroughs. New York, Ace Books, [1962]. Cover art by Frank Frazetta.
Tarzan at the Earth’s Core by Edgar Rice Burroughs. New York, Ace Books, [1963]. Cover art by Frank Frazetta.
Tarzan Triumphant by Edgar Rice Burroughs. New York, Ace Books, [1963]. Cover art by Roy Krenkel, Jr.
The Son of Tarzan by Edgar Rice Burroughs. New York, Ace Books, [1963]. Cover art by Frank Frazetta.
