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      Knowledge is Power

      Scientific American September 1927

      Applied Science for the Amateur, September 1927

      A Department Devoted To the Presentation of Useful Ideas Material of Value To All Will Be Found Here

      • By A. P. Peck on September 1, 1927

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      More in the September 1927 issue of Scientific American
      • Dawn-Man or Ape?
      • In the Editor's Mail, September 1927
      • Patents Recently Issued, September 1927
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