Pirate Isle / The Speaking Stone

From Author Wars - https://authorwars.com/books/pirate-isle--the-speaking-stone-1516641.html

Overview:

Title: Pirate Isle / The Speaking Stone
Author: Lester Dent
Year: 1983
Type: Omnibuses
Series: Doc Savage doubles

Variant Titles:

1983. Pirate Isle / The Speaking Stone