Pocket Books hardcover with dust jacket, exclusively printed by and for the Science Fiction Book Club, first club printing May 1980 (code K14), SFBC #3778, 183 pages, cover art by Jack Woolhiser. 8vo (8.5" x 5.75") Hardcover reprint of Feb. 1980 Pocket mass paperback original. First, and so far only, hardcover edition. First in series, followed by Eye of the Comet, and Homemind.