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      Knowledge is Power

      Scientific American December 1928

      The Back Yard Astronomer, December 1928

      A Department Devoted to Interests of the Amateur Telescope Maker

      • December 1, 1928

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      More in the December 1928 issue of Scientific American
      • A Prehistoric Scene in Mongolia
      • Fibrous Wall Insulation, Daylight Lamp and more
      • Noise
      View Full Contents
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