Number Puzzles for Math Geniuses (Mensa Publications Presents)
by Harold Gale
ISBN 13: 9780812922141
Format: Paperback Publisher: Times Books Published: Jun 1993
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Oracle Mind Games and Puzzles
ISBN 13: 9781872122304
Format: Paperback (96 pages) Publisher: Mensa Publications Ltd Published: 27 Apr 1990
Mensa Number Puzzles
by Harold Gale, Carolyn Skitt
ISBN 13: 9781858683157
Format: Paperback (128 pages) Publisher: Carlton Books Ltd Published: 01 Jun 1997