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      Digital & 4-Year Archive

      Scientific American July 1987

      Books, July 1987

      The global dynamo, the earth's lights at night, Chinese fire drug and Third World agronomy

      • By Philip Morrison on July 1, 1987

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      More in the July 1987 issue of Scientific American
      • Computer Recreations, July 1987
      • Science and the Citizen, July 1987
      • 50 and 100 Years Ago: July 1987
      View Full Contents
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