Jusqu'au cœur du soleil

From Author Wars - https://authorwars.com/publications/jusquau-coeur-du-soleil-394085.html

Overview:

Title: Jusqu'au cœur du soleil
Author: David Brin
Year: 1985
Publisher: OPTA
Pages: 430
Binding: Hardcover
Type: Novel
Title Reference: Jusqu'au cœur du soleil
Notes: Probable first printing. Numbered and limited printing of 1500+30 copies. No price on book. Note that the ISBN on the book is incorrect (it should end with -0).