Tarzan at the Earth's Core (Tarzan Series Book 15)

vii, [1] 301 pp. 8vo. Grey cloth, blue titles. Black-and-white frontispiece by J. Allen St. John. The fifteenth in the Tarzan series, and the fourth set in Pellucidar. "Tarzan joins Jason Gridley's dirigible expedition into Pellucidar to rescue Emperor David Innes."