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Source:
Tech Directions. Dec96, Vol. 56 Issue 5, p18. 19p. 1 Color Photograph, 7 Diagrams.
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Science News. 7/21/2007, Vol. 172 Issue 3, p42-45. 3p. 4 Color Photographs, 1 Black and White Photograph.
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Mathematics Teaching; Sep2004, Issue 188, p10-14, 5p
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Consortium; Spring/Summer2017, Issue 112, p48-50, 3p
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Mathematics Teaching; January 2006, Issue 194, p31-35, 5p
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Mathematics Teaching; June 2005, Issue 191, p22-26, 5p
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Mathematics in School; Mar2004, Vol. 33 Issue 2, p12-21, 10p
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Mathematics Teaching; March 2005, Issue 190, p8-10, 3p
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