Now showing items 8287-8311 of 11458
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(National Science Foundation, 1997-08-20)
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(National Science Foundation, 1997-08-20)
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(National Academy of Sciences, 1998-10-28)
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(National Academy of Sciences, 1998-10-28)
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(2000-10-18)
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(2000-10-18)
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(2001-10-18)
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