Puzzlequiz: Wit Teasers, Brain Teasers, Riddles, Puzzles and Tough Questions
by Stephen Barr
ISBN 13: 9780060919740
Format: Illustrated (144 pages) Publisher: HarperPerennial Published: 01 Sep 1990
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Experiments in Topology (Dover Books on Mathematics)
ISBN 13: 9780486259338
Format: Paperback (210 pages) Publisher: Dover Publications Inc. Published: 01 Jan 1990