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Source:
Science. August 9, 1991, Vol. 253 Issue 5020, p675, 3 p. chart, graph
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Source:
Science; 4/5/2019, Vol. 364 Issue 6435, p70-74, 5p, 4 Diagrams
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Science. August 18, 1989, Vol. 245 Issue 4919, p761, 3 p. graph
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Source:
Science. August 15, 1980, Vol. v209, p799, p2 p.
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Source:
Science. Sept 29, 1978, Vol. v201, p1218, p2 p.
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