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Source:
Science. Nov 30, 1990, Vol. 250 Issue 4985, p1233, 6 p. chart, table
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Source:
Science. 4/12/1985, Vol. 228 Issue 4696, p187-190. 4p.
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Source:
Science. 3/ 1/1985, Vol. 227 Issue 4690, p1044-1047. 4p.
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Source:
Science; January 1960, Vol. 131 Issue: 3396 p276-280, 5p
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Source:
Science; April 1968, Vol. 160 Issue: 3824 p159-163, 5p
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Source:
Science. September 27, 1985, Vol. 229, p1390, 4 p.
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