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      Scientific American September 14, 1912

      The Action of Radium Rays on Blue Sapphires and Blue Rock Salt

      • By A. Miethe on September 14, 1912

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      More in the September 14, 1912 issue of Scientific American
      • Screening as an Anti-Malaria Measure
      • Trade Notes and Formulae
      • Sir William Herschel
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