Emerson Books, Buchanan, NY, 1978, 8^th pr.  ISBN 0-87523-166-7.  Hard cover, 256 pages.  Very good; tight binding, spine ends bumped, two small spots on spine.  Dust jacket has edge and cover wear, short edge tears and small losses, some fading and light soiling.  Book interior clean and unmarked; black & white illustrations.  ‘These unique mind-stretching puzzles call for clear, logical thinking and reasoning.  No specialized mathematics is involved in the puzzles, though numbers do enter to some extent.  There are no traps – no double meanings – no false scents – only straightforward situations, in varying degrees of complexity.  The solutions call for ingenuity, imagination, and insight – and, above all, for the ability to stay with the thread of reasoning, wherever it leads and however unlikely its meanderings. … Solutions with full explanations appear at the close.’ (from front flap)