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      Knowledge is Power

      Scientific American May 20, 1905

      Concrete Foundations of the New Passenger Station, Washington, D. C

      • By Day Allen Willey on May 20, 1905

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      More in the May 20, 1905 issue of Scientific American
      • An Astronomical Clock with an Automatic Adjustment of Time and Church Calendar
      • Business and Personal Wants - May 20, 1905
      • Index of Inventions - May 20, 1905
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