00280nam a2200121Ia 450000500170000000800410001704100080005808200150006610000200008124500290010126000200013030000080015020260720174706.0260720s2003    xx            000 0 und d  aeng  a510.2 VECC  aVecchione, Glen  aChallenging-Math Puzzles  aNew Delhic2003  a96p