Mensa Exercise Your Mind Math and Logic Puzzles (Official Mensa Puzzle Book)
by Michael Rios, Dave Tuller
ISBN 13: 9781402725913
Format: Spiral-bound (96 pages) Publisher: Sterling Published: 16 Mar 2006
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Challenge Your Brain Math & Logic Puzzles
by Dave Tuller,Michael Rios
ISBN 13: 9781402714498
Format: Spiral-bound (96 pages) Publisher: Sterling Published: 12 Nov 2005