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Source:
Science. August 28, 1992, Vol. 257 Issue 5074, p1202, 2 p. table
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Source:
Science. Jan 11, 1991, Vol. 251 Issue 4990, p163, 2 p. diagram
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Source:
Science. Nov 17, 1989, Vol. 246 Issue 4932, p878, 2 p. photograph
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