Walker and Company, New York, 1985, 4^th pr.  ISBN 0-8027-0836-6.  Hard cover, 118 pages including List of Illustrations and Index.  Very good; light edge and corner wear, spine ends bumped; binding sound.  Dust jacket with price intact has some edge, corner and cover wear.  Interior clean and unmarked; black & white illustrations and reproductions.  ‘… features the comet’s workings and wonders, the story of how astronomers have unraveled some – but not all – of its mysteries, the lore of comets…and remarkable scientific facts…’ (from front flap)