Hal Clement wrote this novel-length entry in the Isaac's Universe series that started with Silverberg's They Hide, We Seek. It deals with the discovery of ancient artifacts on an icy planet.
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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.