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Source:
School Science & Mathematics; Apr2005, Vol. 105 Issue 4, p216-220, 5p
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Scholastic Math (Teacher's Edition); 11/7/2011, Vol. 32 Issue 4/5, pT1-T4, 4p
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Phi Delta Kappan; Nov2003, Vol. 85 Issue 3, p207-211, 5p, 1 Illustration
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Instructor (1999); May/Jun99, Vol. 108 Issue 8, p58, 1p, 2 Color Photographs
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School Science & Mathematics; Mar2003, Vol. 103 Issue 3, p169, 4p
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School Science & Mathematics; Apr2013, Vol. 113 Issue 4, p211-211, 1p
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