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      Knowledge is Power

      Scientific American December 20, 1890

      Correcting Irregularities of the Teeth

      • By V. H. Jackson on December 20, 1890

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      More in the December 20, 1890 issue of Scientific American
      • Building Plans and Specifications
      • New Velvet Pile Crysanthemum
      • The Retsof Salt Mines at Greigsville, N. Y.
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