While looking for the Fountain of Youth, Ponce de Leon finds a tribe of Christian Indians who want to sail to Palestine and free Jerusalem.
The audio adaptation is available from Audible.com.
Other resources
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Acknowledgements: Robert Silverberg for cause, support, and cooperation; Ken Seamon for graphics; Rodney Walters for books and info; Alvaro Zinos-Amaro for comments and content; and all the fellow fans who have sent encouragement, information, and translations.