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      Scientific American September 13, 1913

      Permanent Roads an Economic Necessity

      Waste Occasioned by Poor Road-Engineering, and Excellent Results Secured by Good Practice

      • By Harry Wilkin Perry on September 13, 1913

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      More in the September 13, 1913 issue of Scientific American
      • Correspondence - September 13, 1913
      • Kinetic Effects of Crowds
      • A Synopsis of Radiations and their Characteristics
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