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      Knowledge is Power

      Scientific American December 15, 1917

      Better Railroad Ties, The Current Supplement

      • By O. P. M. Goss on December 15, 1917

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      More in the December 15, 1917 issue of Scientific American
      • Foreign Commercial Notes and Queries- December 15, 1917
      • Science- December 15, 1917
      • Strategic Moves of the War, December 6th, 1917
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