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      Scientific American January 09, 1915

      Concrete Viaducts on the Pennsylvania Railroad

      Replacing Insecure Wooden Trestles With a Substantial Road Bed

      • By Day Allen Willey on January 9, 1915

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      More in the January 09, 1915 issue of Scientific American
      • Plant Only Certified Potatoes
      • The Function of the Earth in Radio-Telegraphy
      • Concrete Wine Cellars
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