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      Scientific American February 29, 1908

      The Plagues of History

      Their Periodic Quiescence and Recrudescence

      • February 29, 1908

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      More in the February 29, 1908 issue of Scientific American
      • Heavy Gold Deposits and a Good them Solution for Producing Them
      • Heusler Magnetic Alloys
      • Trade Notes and Formulæ
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