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      Knowledge is Power

      Scientific American September 29, 1917

      The Refractometry and Identification of Glass Specimens

      A Ready Method of Determination for Laboratory Use

      • By L. C. Martin on September 29, 1917

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      More in the September 29, 1917 issue of Scientific American
      • Anthropological Research in Canada
      • German Soap Substitutes
      • The Ego-Cell—A Speculation
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