Gale, Harold — NUMBER PUZZLES for Math Geniuses. 200 Fiendish & Intriguing mind Games.
New York, Times Books, 1993. 2nd edition no pagenrs.. Pb softcover . 21,5 x 29 cm. Scans available. illustrated. Serie:Mensa Publications. very good condition
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30229
€4.50 ($4.96 | £3.75 | ¥792)