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      Scientific American July 1928

      Man's First Mechanical Achievement

      Ancient Man's Stone Implements Passed Through a Definite Evolution

      • By J. Reid Moir on July 1, 1928

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      More in the July 1928 issue of Scientific American
      • A Mammoth Railroad Fill
      • From the Scrap-book of Science--Camera Shots of Scientific Events, July 1928
      • The Back Yard Astronomer
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