Grosset & Dunlap, New York, 1977, reprint.  ISBN 0-448-02253-2.  Tall hard cover, unpaginated.  Very good; illustrated matte boards with some edge wear and a bit of soil; binding sound.  Interior unmarked; thumbing smudges on half-title page; black & white and colour illustrations by the author.  ‘How They Work – What They Do – Where They Fly’