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      Knowledge is Power

      Scientific American September 15, 1900

      Laying a 24-Inch Gas Main across the Harlem River

      • By G. H. P. M'vey on September 15, 1900

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      More in the September 15, 1900 issue of Scientific American
      • Science Notes
      • The Great Ararat Ascended
      • Correspondence - September 15, 1900
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