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Source:
Science Activities. Summer, 1994, Vol. v31 Issue n2, p13, p6 p.
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Journal of College Science Teaching. Jan-Feb, 2006, Vol. 35 Issue 4, , S35, p1 p.
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The Science Teacher. July, 2005, Vol. 72 Issue 5, , S19, p1 p.
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Journal of College Science Teaching. July-August, 2005, Vol. 34 Issue 7, , S31, p1 p.
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