New York: Holt, Rinehart & Winston, [1977]. First edition. A fine copy in a fine first printing dust jacket priced $8.95. (28519). Octavo, cloth backed boards. Inscribed and signed by Niven on the title page. "An exploration team consisting of an exotic mix of humans and aliens investigates a huge artifact occupying a planetary orbit around a sun." - Anatomy of Wonder (2004) II-807. Hugo Award winner, 1971; Nebula Award winner, 1970. [Reference: Anatomy of Wonder (2004) II-807].