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      Scientific American May 11, 1918

      History in Tools

      An Important Factor in Civilization that has been Neglected

      • By W. M. Flinders Petrie on May 11, 1918

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      More in the May 11, 1918 issue of Scientific American
      • Appetites and Aversions as Constituents of Instincts
      • Substitutes in the German Electrical Industry
      • Destroying the Argentine Ant
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