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      Knowledge is Power

      Scientific American July 03, 1920

      Orchard Medicine Quacks, Moisture Absorption Through Varnish

      • July 3, 1920

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      More in the July 03, 1920 issue of Scientific American
      • How Plate Glass is Made
      • The Romance of Invention--XIV
      • Inventions New and Interesting - July 3, 1920
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