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      Knowledge is Power

      Scientific American October 02, 1915

      Geographic Aspects of the War—II

      How Topographical Conditions Affect Military Operations

      • By Douglas Wilson Johnson on October 2, 1915

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      More in the October 02, 1915 issue of Scientific American
      • Gas Turbines brought to Practical Efficiency
      • Notes from a Volcano Laboratory
      • The Ultramicroscope
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