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Source:
Science. Oct 6, 1995, Vol. 270 Issue 5233, p80, 4 p. photograph, table
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Source:
Science. June 22, 1990, Vol. 248 Issue 4962, p1523, 6 p. table, chart
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Science. March 22, 1985, Vol. 227, p1428, 7 p. photograph
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Science. August 23, 1991, Vol. 253 Issue 5022, p872, 8 p. chart, table
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