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Proc. Natl. Acad. Sci. USA Vol. 96, pp. 3455–3462, March 1999 Colloquium Paper This paper was presented at the National Academy of Sciences colloquium ‘‘Geology, Mineralogy, and Human Welfare,’’ held November 8
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Document Date: 2004-01-08 16:45:51
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Proc. Natl. Acad. Sci. USA Vol. 96, pp. 3455–3462, March 1999 Colloquium Paper This paper was presented at the National Academy of Sciences colloquium ‘‘Geology, Mineralogy, and Human Welfare,’’ held November 8