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Source:
Science Activities. Winter2010, Vol. 46 Issue 4, p7-14. 8p. 2 Black and White Photographs, 2 Graphs.
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Science Activities. 2021, Vol. 58 Issue 2, p77-88. 12p. 6 Black and White Photographs, 1 Diagram, 4 Charts.
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Science Activities; Mar1980, Vol. 17 Issue 1, p31-37, 7p
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Science Activities; Dec1979, Vol. 16 Issue 4, p21-24, 4p
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Science Activities; Jan1976, Vol. 13 Issue 1, p26-34, 9p
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Science Activities; Dec1975, Vol. 12 Issue 6, p33-40, 8p
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